well, do you prefer accurate guns that require lube after each play or do you prefer a gun where it shoots alot of paint and never really requires any sorta maintenance?
As for buying off pbnation or buying new. I would say that depends on your budget. If you search good enough on pbnation you can find great deals but you chance it because its like buying a used car. If you have the money I would buy brand new...if you wait a little till Oct 22-26th you can probably make a decision better since new guns are coming out. (ie DM9. etc)
then again..I am selling my dm7 in sig for a relatively cheap price for people I know