The old MSI K7N2 Delta-ILSR is a great beginers motherboard if you ask me. Not sure if there are any around anymore though since it is a rather old board... It does support AGP 8X and SATA Raid. The only problem i had with it was that the Northbridge heatsink fan failed and made a odd sound at startup, but it dont realy matter, there was only a 5F increase in temp when i took the fan off.
Crap i just looked it up, when i bought it i paid $120, now its down to around $60 and its still getting great reviews.
EDIT 2: Oops thats its cousin. but there almost the same, only differnce i noticed was the layout of everything...