I used to shoot a Hasselblad. When I got rid of it, and later decided to replace it with another medium format camera, I got a Rolleiflex 2.8E. Best decision I have ever made photographically. A 2.8E is out of your budget constraints, so I won't go down that path of recommending one, but I'll just toss in the caveat that you may well end up there sooner or later after you fall in love with TLRs.
Another model to look for (you'll need to shop on Ebay for them as they're not common outside of Japan) is an Olympusflex TLR. They made them in 2.8 and 3.5 models. 2.8s go in the $500 range, but you can find a 3.5 (which will be lighter) for $250.
And then there's the Mamiya C series TLRs - C2, C22, C220, C3, C330, C330F, C330S. I don't know all the differences between each version, but the C2, C22, and C3 are not as full-featured as the 220 and 330 versions. They all feature interchangeable lenses.