Build review of what could be considered a hot rod

So this is my first build, and I was wondering if I could get some feedback from some people who have done this before.

SYSTEM USAGE: I don't do that much gaming or overclocking because I've never really owned a decent computer, but i was hoping to have this prepared to do some of both, perhaps a lot of both if I get into it. Also I'm sick of wading through second rate computers and want something that will blow through my every day web surfing, coding, and media needs. Media needs meaning HD movies and playing music. Also will probably be running some dual boot combo of linux and windows, so linux compatibility is a must.

PARTS NOT REQUIRED: noted in parts list

ADDITIONAL COMMENTS: just kind of looking for a sanity check and what you think this would be capable of. Also if there were any bottlenecks, or something like that. Thanks.
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Antec SUPER LANBOY Silver anodized aluminum ATX

Antec SmartPower 2.0 SP-500 500W

I know that the above case and PSU are a little outdated, but I bought them a few years back, and they've been sitting around my old house. Figured I could put them to some use. The PSUs compatibility might be my biggest concern on this build

GIGABYTE GA-EP45-UD3P

Q9550 Yorkfield 2.83GHz

G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066

EVGA 512-P3-N973-TR GeForce 9800 GT 512MB

2 x 500gb seagate barracudas (already owned)

2 x Western Digital Caviar SE16 WD5000AAKS 500GB 7200 RPM

the above 4 drives will be in RAID 5

SAMSUNG Black DVD Burner

My concern, along with what hunter315 stated, is will your 9800GT fit into the case with it's length.

thanks for your reply guys, As far as stuff fitting, i measured and the distance from the pci guards to the drive bays an it's 10" and that card is supposed to be 9", but you're correct, the case size is really pushing it

So the situation with the case and PSU is that i already own it, so if stuff doesn't fit, that really sucks and i'll have to go with a plan B (feel free to recommend plan B, b/c i don't really have one yet), and that probably won't happen until i get the rest of the necessary stuff and find out plan A doesn't work. Do you think it would be worth it to sacrifice down any of the other hardware for the sake of not buying a new case?

I had a feeling there might be an issue with the PSU, and that's been confirmed, any thoughts on the rest of the hardware?

As far as budget, all of that stuff combined at full price is about $850, which will have to go up if i have to get a new case/PSU, I could probably be talked into going up a little bit, but it would take some convincing.

As far as resolution, i would say 1920x1280??? Is that reasonable for that card? I guess the graphics card area is my most ignorant area, I need a new monitor, but i haven't started looking, thats going to take a few more paychecks......... I just wanted to get the computer, and get it set up while i had free time this summer. I picked that card b/c it was a good price, on a chip my friend recommended to me, and it had really good newegg reviews