Q: "A good DSLR camera for someone with mid-level photo experience?"
A: Any dSLR is good for someone with mid-level photo experience.
Q: "I have been doing photography for years with a film SLR."
A: So you should already have an idea of what you want (film, digital - basically the same thing, especially to someone who has experience).
Q: "I don't see myself being able to spend a few nights a week at the community college's dark room"
A: Then send them to a photo lab and have them do it for you.
Q: "I would like one that already has a flash, but with a hot shoe for when I'm ready to purchase a flash."
A: All dSLR cameras, from budget to mid level to professional have hot shoes. (again, same as modern film SLRs)
(though an external flash will take your photography farther than a built-in flash)
Q: "The Canon EOS Rebel T2i was suggested to me, but I'm not sure if it's the right one."
A: That is a budget model (but that does not mean it's bad.)
Most people cannot tell the difference between a budget model ("consumer") and a midlevel model ("pro-sumer"). A mid-level one would be something like a canon 50D.
Q: "What is the best camera at any price,?"
A: Probably a medium format digital SLR from hasselblad or leica. Or one of those 4x5 view cameras.
(Really, an 'experinced film SLR' user should know better than to ask such a question. As someone who shot film on an SLR for 15 years before getting their first digital SLR, I'm a little disappointed in this question!)
Q: "and what is the best camera under $1000?"
A: There is no 'best' (again, a film photographer should know this). There are many good models, all from reputable companies. What might be good for you might be bad for someone else. After all, it is the photographer that is important (not the camera).
For example, I have canon. but I have never gotten use to using a lens without an aperture ring. I noticed that nikon still make lenses with aperture rings, so I have considered switching. It's expensive to switch camera systems, but fortunately I haven't invested TOO much money into canon. I think Pentax also has aperture rings on their lenses, so they are another possibility for me.
combination of common sense and elbow grease