Nvidia have a very flexible naming system

In this case they seem to be using SE, LE, GS and GT with the GT being the fastest.

Try to find the GT model where you can. Some models of 7300 GT may even outperform the next card up the 7600 GS.

Check the memory offered on that 7500 LE. If its a lot then it could be "Turbocache" and they are just being generous with your own main memory. Avoid!

regards
prixat