Which Motherboard suits me best.

All right. I think I have found some pretty good parts as far as everything else goes, but i am having touble finding a motherboard that is right for me.

CPU

AMD Athlon 64 X2 6400+ Windsor 3.2GHz Socket AM2 125W Dual-Core Processor Model ADX6400IAA6CZ - OEM

GPU

SAPPHIRE 100245L Radeon HD 4850 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Retail

PSU

CORSAIR CMPSU-550VX 550W ATX12V V2.2 SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Power Supply - Retail

RAM

OCZ Platinum 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory Model OCZ2N10662GK - Retail

As for things that I want on my motherboard I need it to have at least 1 PCI express 2.0 x16 slot for my gpu. Also, it should have 4 slots for my ram. (open for new ram suggestions 4gb please). I am new to building computers so please help me choose one that is stable and will last. I do not play to over clock. I am going AMD if you didn't see. I would prefer something around 80-90 dollars.