Maarkr
Now I'm on the fence about the AGC or StrumMaker IV for a rhythm/acoustic. 

I have both, and although SM4 has more sophisticated options for strumming, AGC has more guitars. My preference for AGC may stem from my predilection for picking over strumming (never cared for anybody's strum engine, really), but AGC gets used a lot more than any other acoustic guitar library I have. If I need complex strumming that's difficult to program, then I'll go to the trouble of setting up a microphone and playing it the traditional way.
 
BTW, don't overlook the version of AAS Strum that's bundled with Platinum, for your simpler strummed backing pads.

Nobody has mentioned Bolder Sounds yet. They have a nice range of stringed instruments. Banjo, Mandolin and the wonderful Guitarron Mexican acoustic bass.

There is a cyber Monday sale on now, sorry, no links as I am posting from my phone.

+1 for Albion ONE (plus I have some of the labs series)
I have drum director from Loop loft (both flavours) and hardly use them, 99 sounds have some great freebies
 
I have Cassetto which is still on group buy which is good value to say the least (especially if you have Izotope IRIS

I've got Session Horns Pro, and think it's pretty fantastic.
I just bought Vintage Organs on the weekend and can't stop playing with it.

Glyn Barnes
Nobody has mentioned Bolder Sounds yet. They have a nice range of stringed instruments. Banjo, Mandolin and the wonderful Guitarron Mexican acoustic bass.

There is a cyber Monday sale on now, sorry, no links as I am posting from my phone.

I really like bolder Sounds.  They cover some turf that nobody else does.
 
http://boldersounds.com/

Precision Sounds specializes in obscure ethnic instruments and some of the lesser known organs.

I'm using the free Kontakt player, mainly for Abbey Road 60's and 70's drums. 

Don't forget all of those BigCatt freebies.

Rain
I'm using the free Kontakt player, mainly for Abbey Road 60's and 70's drums. 

Rain, just wanted to say I love your avatar. May need a little love though for brother Henri, "The Pocket Rocket".
(one of my favorite sports nicknames)