I'd go Abit KT7-RAID also, I've had a very good experience with their RAID, and the Promise ones I've had several say they've fail and rebuild over and over. Throw the drive in another system no problems.. and going on 6 months still no problems..
Also, I'd ditch the 19" monitor scene and go for a Trinitron 21", either the KDS or an actual Sony.
The prices you have are probably a bit out of date, but I'd guess you would like to know the system I just bought since it's quite similar.
Everything from mwave.com except the processor / heat sink
AMD 1.2GHZ Tbird $285(yes, $285 @ altima2000.com)
Cooler Master DP5-6H11 $20 (had to buy at altima2000 to extend CPU warranty from 30 days to 1yr.)
2x256MB PC150 C3 SDRAM (I opted for PC150 over C2) $173 ea.
Abit KT7-RAID $149
2xIBM 45GB 7200rpm HDD $163 ea.
SB Live Platinum retail $169
Toshiba 16X DVDROM $105
250MB IDE Internal Zip $79
GUILLEMOT GeFORCE2 ULTRA PRO 64MB W/TV out $439
Total without monitor / speakers $1,918
Since I already have a 21" Trintron I'll keep it
If I were buying a new monitor and worried about price I'd get the KDS 21"/20V AV-21TF .24 1600X1200 85HZ FD TRINITRON
if I wasn't worried about price I'd get the
SONY 24"/22.5V GDMFW900 .23 2304X1440 80HZ FD TRINITRON OSD
I already have a 8x4x32 Plextor CDRW which I'll throw in,
but if I needed a new one I'd get the Plextor 12x8xwhatever it is now.
next I need to decide which 5.1 speakers to go for.....