Best Motherboards

Hi,

I was wondering where is the best place online to buy motherboards?? I am on a tight budget, and i need one really bad. Will Socket A motherboards fade away?? I have a AMD Athlon XP 1800+ 1.53 GHz CPU for Socket A motherboard. I also have 384 MB PC2100 333Mhz DDR-SDRAM memory modules. i have a 40 gb IDE hard drive and a dvd burner, do you think my computer will be windows vista ready?