Vampire 500 is on hold until first batch of Vampire 600 is shipped.
Vampire 500 is not question, I guess it is month or two until more news or pre orders. So save your money!
I think that next thing is Vampire 1200
Those accelerators (V600 and V500) have no alterlnative - lowest price - best performance.
Forget about the rest - this is the future for classics - especialy A500 and A600.
One more thing V500 is currently faster than V600
Majsta was faster