Epu- I couldn't comment on the SRX drums board and how it compares to the JV board 'cause I haven't heard it yet!
To me, the drums in the JV board sound very realistic if you play them thinking like a real drummer!!!! The guy that I worked with did some demos with just his guitar and vocals and sounds from the bass and drums board and it sounded like a real band IMHO!! That's really saying something I think!!!!!!
Southern Comfort- The future loops construction board for the Triton is a massive waste of money IMHO!!!! I wouldn't be caught dead paying that amount for 20 songs in the sequencer set up to trigger just OK sounding loops which you can get of any sampling CD or sampling them yourself. Somone at Korg was definetly on something when designing this board!! Of course this is Just my Opinion. Cheers.