I've done quite a lot of 1/72.
Hasegawa and ESCI are from an earlier age. The details are rather soft, and in some cases like the ESCI M60s and Abrams, the wheels are molded as one wheel, so you have to be prepared to file a groove in the middle if you want them to look accurate. Also, with ESCI, make sure you get the boxes with the yellow track graphic over them--that signifies individual tracks which look much better than the older crappy and stiff rubber band tracks. Here's an ESCI Abrams that I recently finished.
And here's a little ESCI diorama: that Sherman actually comes with a full radial engine!
PST is another older mold company which did some nice Russian subjects. Their details can be rather thick---hatches, lights, etc,--but they do come with indy tracks as well, and with a little work, you can make them presentable. Here's one of their offerings: the KV-II.
Dragon's models are, of course, the state-of-the-art, but a BIG bummer about them is that they come with those stupid "DS" rubber-band tracks. You can't sag them, obviously, but you CAN sometimes steal tracks from another kit---1/72 Revell is a good option; their fine little models usually have indy liink tracks--and greatly improve thier track-look. Of course, dependent on the model, sometimes you don't have to worry about that. All other details however are, in many cases, simply shrunk-down from the larger 1/34 scale offerings. I have a small collection of Dragon 1/72 kits. The Maus model, in particular, is interesting in that you can build it as the prototype with the dummy turret on it. Here's a few.
The E-100
As I mentioned, Revell has some fine models. I like these a lot, because of the detail and the indy tracks.
I mention Trumpeter's line with reservation, because the last time I built one, I almost had to send the tracks to a fission lab to get them to join. I have yet to find a glue besides the very-inconvenient epoxy cement that will join them effectively. That being said, however, they have some nice offerings with really nice detail.
You'll also find quite a few "Eastern" offerings from companies like ACE and Pegasus. I don't have much experience with these. I do remember trashing an ACE Waffentrager, which was unbuildable; horrible fit, lousy detail, photoetched tracks if you can believe that. However, between what I've detailed here, you shuold be able to find something that suits your skill and price level. Good luck!