1400 is pitiful for a gaming comp....howver, it can be done (just far from top-of-the-line)
you can eaily get a cheap A64, just not a newer model, and not FX series (I love my FX-53, but it is still 700 USD!)
Videocard: I'd stay away from the Radeons (personal pref, I
HATE ATi) Try a 6600 GT or something maybe...or even lower 6000 series, or maybe even an older FX series.
Sound: well, onboard sucks, expecially for newer games with 3D support...I'm gonna say Creative all the way....you don't need to go top of the line here...each generation has few improvements (who can tell the diff between 90 and 108 signal-to-noise ratio? not counting an android....lol)
Motherboard: Don't go cheap here...you get what you pay for...I like my MSI K8N Neo2 Plat....its somewhere around 150 USD, but it is better than the ASUS boards, and it doesn't have PCI-E (good for you, pci videocards are not cheap)
Memory: go a well known company. I love Corsair, but Crucial is prob cheaper...go as good as you can afford here the lower tha latency, the better. (FAQ: what does latency mean - how fast the memory chips can switch between the rows and coulumns, or more basically, how fast it can accept data)
Hard drive: I don't like Maxtor because they seem cheap. A good SATA drive is best, and I love Western Digital for their 3 yr warranty...my Raptors get a 5 yr, but that is rare.
CD/DCD - ROM/RW: Well, I don't know what you want here. I'm holding off on DVD-RW for now, since dual layer is fairly new in burners, and therefore unreliable and expensive...I love Plextor's premium drives, but they aren't cheap...Avoid Garden Variety drives, I'd say plextors cheaper drives?
Case: Whatever works for you....
Floppy drive : Don't forget this....despite what people say, you still need one of these. :laugh:
Power supply: Antec does pretty good with their True 480W models, and their 430W models. Once again, you get what you pay for...Avoid the flashy 'UV light' sort of crap. Unless this will be a 1400 paperweight.....hehe.
I'd say look between
www.newegg.com and
www.mwave.com
Use newegg for finding the parts first, then see if mwave has it cheaper (don't forget to look at shipping costs too)
If you have any questions, please feel free to ask.