The price is a bit in question... From what I can remember when I was searching for a set of BB7s a few months ago you could find 160's 08's or 09's new for about $100 front/rear with rotors but less levers and cables add in another $15-20 for cables and $20-40 for Levers and they add up pretty quick. This is assuming new and you are not using current levers- a minimum of $135...probably more
Juicy 3's or 5's new for $50-70 per wheel complete so pretty close in price like another response said-
Now that the Elixir's are out you can pick up brand spankin new 08' Juicy 7's on good old ebay for about $180-200 (sorry LBS's) let alone $140-170 used.
The on the fly pad adjustability via the big red wheel is also a big plus so rubbing is alot easier to fix quickly on the BB7's VS any of the Juicys.
I have a buddy that got so frusterated with a set of Juicy Carbons (basicly the same as 7's with carbon levers) he had me swap them out with BB7's and sell them on ebay. Both he and I ride cross country so heat is really not an issue if you ride in areas where you think this could be an issue I would say the Hydros may suit you better.