From what I've seen, I think HD is pretty spot on with his guestimations of the reissues. For some reason I don't see as many TFC hounds or blitzwings compared to the others.

You can get a vintage loose complete C8-C8.5 blitz from ebay US auctions (not BIN) for $25-$30 easy. I've seen a few in the past fortnight sell for around that price. I'm currently hunting one too, so I've been monitoring Certainly a hell of a lot cheaper than the TFC one (When I first started collecting I remember seeing two of the MISB TFC's sell for $170US )

Vintage Hound I think has always maintained relatively high market value. Maybe bc he's a tad fragile? Never had one myself, but broken hounds are always sold in old G1 scrap lots that frequent ebay. It may be difficult to find an original one for the right price, but if you want something in minty condition then the TFC release may be the better alternative. Not much of a price difference (IMO) between the two.