Help with a Office build

My parents own a Financial Services Firm and they're running 2 computers that need replaced. They can be the exact same, and need to be under $500 +/- $10.
I went through and picked out some parts, and would like some feedback on the parts, and please tell if I'm missing anything. TY!

CPU: Pentium D 805
http://www.newegg.com/Product/Product.asp?item=N82E16819116001

Motherboard: ECS P4M800PRO-M2 (V2.0)
http://www.newegg.com/Product/Product.asp?item=N82E16813135027

Memory: pqi POWER Series 512 MB DDR2 533
http://www.newegg.com/Product/Product.asp?item=N82E16820141191

HDD: Western Digital Caviar SE 160 MB 7200 rpm ATA 100
http://www.newegg.com/Product/Product.asp?item=N82E16822144203

DVD Burner: NEC 16x DVD+/- R IDE
http://www.newegg.com/Product/Product.asp?item=N82E16827152058

Floppy Drive: NEC Internal Floppy
http://www.newegg.com/Product/Product.asp?item=N82E16821152005

Case: Rosewill R604TSB-N
http://www.newegg.com/Product/Product.asp?item=N82E16811147031

PSU: The one included with the case
http://www.newegg.com/Product/Product.asp?item=N82E16811147031

Keyboard/Mouse: Logitech Internet Pro Desktop
http://www.newegg.com/Product/Product.asp?item=N82E16823126152

OS: Windows XP Pro SP2B
http://www.newegg.com/Product/Product.asp?item=N82E16832116059

TY for the help

looks good to me... BUT, you can cut the hard drive in half a save some money... you could use the old keyboard and mouse they have and save a couple of extra bucks...

I thought of that, but the other computers are going to be used, in an extra room for basic internet, so I can't keep the keyboard and mouse ><. Also, They need more room than 80 GB, they're running Financial apps that take up too much HDD space for a 80 GB (one is running out of room with one)
BTW ty for the quick reply

If they all have to be the same, why not do thin client on them all?

Sry for the noobiness...but whats thin client?

Thin client is where you set up a server with everything you need to work with, then set up machines that connect to the server and use the server for EVERYTHING - even the desktop. It requires fairly low system requirements since most of the real work is done by the server.

Uh...I don't really know how to set that kind of think up, and this is just a small business (the reps buy their own computers and other stuff), so I think i'll just stick to two computers .
Any other opinions on the components?

I have another question, If I buy a SATA2 HDD, will it work with the SATA1 sockets on the MoBo. I know if it can it'll drop down to SATA1 (150 mb/s) speed, but that would still be faster than the IDE and it costs the same (i found that SATA1 cost too much ><)

The one i would get instead of the one above would be:
http://www.newegg.com/Product/Product.asp?Item=N82E16822144415

Sry this is kind of a newbie question

Yes, it's backward compatible.

ALright ty that'll save me a little money and it'll be faster