hrmm, well in that case I guess your selection is rather good for the cost..
Other than the mention of the PSU there, I would change out the CDRW to a liteon 52x (sold at both newegg and zipzoomfly for 28$). Its the best CD burner available today.
Just for the hell of it, he is the cheap 350$ systems I build for workstations. I find them very stable. I mustve built close to 100 last year, just of this configuration(or very close to it) They are not for doing any serious work though.
CPU:
Sempron 2200+-2400+ 60$-65$
MSI Km4am-V 58$
Corsair 256MB PC3200 40$
WD 40GB 7200 rpm w/cable 55$
SLK3700AMB w/350w 70$
Liteon CDRW 30$
Floppy 15$
_____________
335$
Logitech keyboard and optical mouse usually cost 25$ or so...
Up until a short while ago I was putting AXP's in it.. but they have risen in price quite a lot. You can probably do better than the slk3700 w/ 350.. maybe get a fortron psu, in a cheap case.. but for the extra 30$, I like the slk3700 case from antec.