Just from here on AC, I'm definitely going to check out
ACI (never heard their stuff and the SapphXL is getting high praise)
RAW (heard a bit of the HT3 last year and it was great, looking forward to more)
AV123 (depends on what they bring - if it's the Strata Mini, check it out - I'll definitely be talking with the guys)
Lower priority (for me)
Salk (great stuff, but more than I'll be spending)
Selah (will be interested if they bring a pair of Tanzanites)
Bolder (interested in hearing a CDWG setup)
GR Research (interested in checking out the new omni stuff Danny is playing with - I also like to play a few loud things in there

)
HagTech (say hi to Jim)
I'm sure I missed some AC folks there, but this is off the top of my head.
For just sheer good sound to check out, regardless of price/interest, I'd like to check out:
Genesis (never listened to anything from them)
Gershman (the Black Swans sounded very good last year IMO)
Usher (made it to their room after they started break-down last time)
Eben (liked what I heard last year)
Zu (only herd a tiny bit last year and liked it - want to hear a bit more)
LINN (never heard any of their speakers)
I'll also keep an eye out for those in the under $5k category.