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A few forum members have AR racing motors in there cars and are very pleased with them. They are very reasonably priced. I don't have a link, but they always have a couple ebay auctions going.
I just spent a small fortune getting my BB rebuilt. If I were to do it over again I would seriously consider a crate, and AR would be the first people I would call.
I went down to Jim Pace, bought the 502 bare block, bought the internal components that I wanted, assembled the whole pile, and wound up with 533 cubes. cost me little more than 4200 for the short block, included in that price was balancing, and all machine work. Downside to this there is no guarantee...but so what, you take your time, get quality components, assemble the engine right, keep it clean, and the motor will live.