More RAM or New Set-up?

[Quitoman]

Athlon 4200 X2 2.2GHz (Socket 939)
Kingston 1.5GB PC3200

Should I buy 2GB more of PC3200 for $50?

or

Cheap new set-up?
Mobo - $35 http://www.newegg.com/Product/Product.aspx?Item=N82E16813135074R
Athlon 5000 X2 2.6GHz - $66
G-Skill 2GB PC2 6400 - $45

 

[Quitoman]

sadly, i am unable to OC my current processor due to my P.O.S. Mobo