i dont like the flat call.. if he has something like QQ or KK, hes coming with a raggy flop anyways.. and the short stack could have something like AK and decided to put all the money in the middle hopeing to spike a good flop.

i think the flat call might look a little sketchy to the guy behind you.. not only that you give him a chance to take the lead in the hand and then you're incorrect to fold. if he has KK, spikes a K, and now you're sitting on a flop with a lot of money in it and hes got you beat you have to call.. get it in there now.. if he comes with you.. hes got KK and maybe QQ.. and you're a huge favorite to win.

you're right about the getting greedy thing.. if you push and he sucks out on you.. oh well thats poker, if you call and he calls and spikes a set you'll be kicking your self in the face.. all because of a few hundred extra.