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Your "bread and butter" synth(s).
Thor for me. Not only is it just as kick-ass as it is in Reason, it has the most sensible user preset system of all the synths I tried. Limitless sounds for me.
Name yours below and give reasons. 
Comments
I'm a noob so take my input with a pinch of salt, but my favourite synth is Animoog because it has it's own very distinctive sound which subjectively I happen to really like. I find the touch keyboard in Animoog very expressive to play as well.
Thor is great because if you need a simple mono bass, you can make it in no time. If you need 3 oscs, 2 filters, a butt-ton of modulators and a way to route them to 20 different destinations, you can make it in no time.
Sunrizer Huge range of sounds.
Exactly, Thor is great for huge and deep drones or bass (or both). Also it has an awesome range of oscillators.
I like Sunrizer too for slow detuned pads or poly synths, it sounds very similar to Thor.
With this two synths I can obtain many BoC or shoegazey sounds.
I'm finding my Synth tastes change over time. I'm a hardcore Sunrizer-NLog guy with a little Nave thrown in for spice; but lately I've been only playing IGrand piano and a lot of Neo-Soul Keys. That thing is humongous!!! Different sounds for different clowns...
Sunrizer or Eden.
Nave, Alchemy & iVCS3…for sure
iVCS3.... want so badly.
No much original, but my vote is for Animoog.
@Sinapsya iVCS3 is a 'bread and butter' synth? I should listen to your soundcloud.
Lately it's Nave or Alchemy, though Alchemy has never been as stable as I woud like
Thor and Sunrizer are usually my backups.
iSEM and TF7 are consistently finding their way into songs these days. Tiny little tweaks yield amazing results. And for great sounding bass that is easy to dial, does not clip, and has a straight ahead interface, 76 Synth is just wicked. Maybe I'm late in the game on that one, but 76 is killer. It dials amazing multi osc bass in seconds. If only the osc could be tuned in 76...
+1 on 76 synth. I'm a bass player so the low end blew me away. Simplicity, unique voice and pretty inexpensive as I recall. This stuff just keeps getting better.
+1 for the osc's nedding to be tunable.
It's the one reason I haven't picked it up all this time. I remember this synth from a ways back (in iOS time) and it has always intrigued me. And while 3 Osc is nice, I just gotta have the ability to tune them out from each other.
I may not be far along in the iOS music world, but I would have to say: Garageband, Music Station, Magellan Jr., Alchemy, Figure, Gestrument... I have many others that I'm waiting to upgrade on to see if they're worthy.
Thor, Animoog, Caustic's FMSynth
Nave, WaveMapper and Thor.
Magellan, Nave, Animoog & Thor
As learning tool, after trying few, I m using: Sunrizer; although the real goal soon is to move to Animoog.
I love dark pad sounds, so Animoog or Sunrizer for me...
Animoog, iMini and SynthX for me although SynthX doesn't have audiobus witch blows majorly. I'm surprised no one else wrote iMini. Also surprised by the 76 being mentioned. Will have to give that one another look.
I've decided to focus on Thor, because it offers the most options for me. It's the only synth that I have with 3 independently configurable oscillators, although a separate noise osc would be even nicer. Many oscillator types, really configurable with the mod matrix. A really small minus is no MIDI learn and no IAA - curious to see what Propellerhead will do in the future with the iOS market, if it's worthwhile for them.
I also like iMini for bass sounds, but the MIDI implementation is quite bad there.
As for the rest, Sunrizer and ISEM I haven't used almost at all. I hate the iSEM interface. Nave I don't know how to use yet, but I plan on looking at it more. Animoog is interesting, but the problem is I don't know how to get from a sound I have in mind to actually hearing it - not even sure it's supposed to be used that way.
Magellan have a good user preset system too and with IAA.
Addictive Synth by far.Nothing can produce crazy sounds like this if you know what goes on.Very unique.
Animoog, isem, imini, magellan
iSem, Alchemy, Thor, iMini, Nave, Animoog, and Sunrizer--my first tier synths (in that order). I don't know whether I would call them "Bread & Butter" synths, but they are the ones that get used the most here.
Are the bread and butter synths the ones you have jams on?
Hahaha!!! I almost answered you seriously @PaulB, and then I realized.......
As a low-fat spread kind of guy, I'll say 76 Synth.
@PaulB - how long do you spend each day coming up with these witty remarks, I mean I'm sure now that your known for them you feel some obligation to keep them coming to uphold the rep : )