That time of the expansion again.

Due to recently swapping characters I wasn't level 80 for Cata start, but I pushed last night and made it to 75 with my baby druid who's a JC, in order to be able to start working on the JC tokens as soon as possible (only missed a day).
In a couple of days I'll be able to buy my first recipe and... I'm at a loss as to what to choose. I figure a lot of people will go for the pure cuts (STA/AGI/STR/INT/SPI) so those should be pretty quickly flooded. Any idea what a few not-so-obvious gem cut choices would be in order to profit from them for a few days at least?
Also, allow me to contribute something.
I powered JC last night from 450 to 475 (to unlock the daily). There was a dire lack of gems on the AH (The Maelstrom) so I figured "let's try prospecting". I bought all Obsidium Ore under 20g/piece (total of about 10-20 stacks or so) and prospected it. At lowest current AH prices as of last night (green gems 70-150, blue gems 200-500) I actually would have made a profit if I was to put the gems back on the AH. Green gems got me slightly above cut even with the ore cost and I pulled 4 blue gems.
Might help someone with money to burn, although it's risky since the market for gems is sort of volatile price-wise right now, I think. People are buying them to power their professions so the prices are high, no idea how long it'll last. On the other hand, same situation is for the ore, which should also go down.