What is a good combo for turning high rpm?

Here's an SB2 for $18K: http://www.race-cars.com/engsales/chevy/1245343673/1245343673ss.htm

Here's an P7 Mopar for $19.5K two years ago: http://www.gt1da.com/board/index.php?showtopic=4041

This ebay ad from a year ago had a P7 at $13K obo: http://cgi.ebay.com/ebaymotors/NASC...ryZ33615QQihZ012QQitemZ220334058418QQtcZphoto

Talk here of P7 motors: http://board.moparts.org/ubbthreads/showflat.php?Cat=0&Number=4992101&page=0&fpart=1&vc=1

I wonder if the P7 motors are actually cheaper than the SB2's because they are not as popular? The fact that not many people are going road racing, pro touring build, hot rod build with a Mopar P7 motor could be to your advantage.