I started off with the Big Agnes Seedhouse SL1, and after spending a couple evenings in it, I figured out that when they said one-person tent, they were pretty serious about it. So, I updgraded to the Seedhouse SL2 about two years ago, and have been very pleased with it. It fits me comfortably with room to sit up and fiddle about, and there's no problem about bringing my panniers indoors with me if I want to. It takes a little more room to pack (meaning that I strap it to the bike rack instead of stashing it in a pannier like I can with the SL1), but the weight difference is negligible when accounting for the added space/comfort. Now, when you add in a roommate, it does get a little "cozy" in there...

If you want side doors, I would look at MSR's Hubba Hubba tent. If I ever replace or upgrade the Seedhouse, that's probably what I would replace it with.