reflux

This will do you nicely:

Newegg.com - ASUS P5N32-E SLI LGA 775 NVIDIA nForce 680i SLI ATX Intel Motherboard - Retail

Or, if you're looking for something cheaper:

Newegg.com - ASUS P5N-E SLI LGA 775 NVIDIA nForce 650i SLI ATX Intel Motherboard - Retail

And this is decent RAM:

Newegg.com - Crucial Ballistix 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Retail

And while you're at it, why not grab a budget Core 2 Duo?

Newegg.com - Intel Core 2 Duo E6550 Conroe 2.33GHz 4M shared L2 Cache LGA 775 Processor - Retail

It'll be much faster than your Pentium D, and you can overclock the nuts off it as well

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