(Full disclosure: I have a 3.5E posted for sale)
The "best" model, in my opinion, is the 3.5F. It's lighter than the 2.8 while being only 1/2 stop slower, and the folding/removable hood is nicer than those on previous models. You'll find models with either a Xenotar or Planar lens. People have spent a lot of energy debating which is better, but really I don't think anyone can actually tell the difference. They're both excellent. Unfortunately F models are collectible and thus expensive.
Which brings me to my unsatisfying non-answer: *any* postwar Rollei TLR is going to be excellent providing it's still in good condition. Rolleicords are lighter, simpler and much cheaper, Rolleiflexes have more features and command higher prices. Having owned a bunch of Rollei TLRs, I do find I enjoy using the Rolleiflex more than Rollecord, but quality-wise they're closer than most Rollei-fans will admit.
Regarding the meter, they're often non-functional and even when they work you'll probably prefer to use a handheld meter. The 3.5f is coupled; the 3.5e meter is not, so it's even less useful on that model. You can always remove the meter if you want, providing you can find the plug that goes in its place. I think someone sells new ones these days.