great third party styles for BAND IN A BOX
http://www.nortonmusic.com made by a "real" lifetime musician, this convinced even me (normally style-hating me) to buy this program. Go to the site and give it a listen.
If you email him privately, he'll send you a couple of midis made with his styles to play on your own system.
With his software added to BIAB, you can make an arrangement in less than 5 minutes (or so he says) I haven't received mine yet but will report back.
As for latency with soft synths its a fact of life. Better drivers help. But, Most people find it easier to record using their local keyboard sounds, then assign any soft synth instruments afterwards.
hope that helps,
KK
cakewalk help pages
http://www.roncat.net/cakewalk/ music
http://www.roncat.net/private.htm song exchange/music email club with mp3 storage for active members
http://groups.yahoo.com/group/keyboard-synth-module-club/