Oh and for my opinion from what I have from this list (SSHD, Flow, PJ Monsters & Eden, Wipeout HD and Pain)
I would say Pixel Junk Monsters + Expansion is most worth it if you like strategy games and especially if you have a friend to play 2-player with. The game is really too hard on single player.
FLOW i would skip.
Pixel Junk Eden was fun too, but its really challenging & kinda repetitive going for 5 spectra on every level and its not for everyone. Some of my friends don't like it.
Pain is really fun to launch people off slingshots into stuff and destroy the levels, but it does get old after a while. They also charge a $1 for a lot of the extra characters.
Finally Wipeout HD is really cool, great graphics and 60fps, but at $20 you have to like racing games.
Also one game not on your list that I would recommend is Bionic Commando Rearmed. Its probably my favorite downloadable games off the store followed by PJ Monsters, Wipeout HD and SSHD. Its also a very challenging game.
