340 blocks, whats the damage on the wallet?

So what are they going for now? I saw one in the marketplace for 1000, already machined. Is that average?

Also, what about Mopar blocks? A couple of years off from now, but I always wanted a 340 (no stroker stuff, just a 340 stroke). I may be better going with an R3 block. Are they still hard to get? What about the siamese R3 blocks? Are they worth the extra money, keeping future upgrades into consideration of the higher costs (Forced induction, nitrous, roller cam)?