I'm looking at about $175-200 incremental spend for 24 hits. Since I signed up for the US Airways MC for this deal, I'm looking at about 90K miles total. Not bad, but I'm hoping I get some travel plans for hotel stays/car rentals soon so I can knock out 8-12 hits for 35K-55K more miles.
Also, while the GS2010 thread is extensive (500+ pages), it doesn't really help for this year since many of the cheap loopholes have been closed.