I just bought a Toro Personal Pace one with the 6.75ft/lbs torque engine. While time will tell on its long term reliability, this is a great mower as far as usage! Instead of selecting a speed, you just push the mower and the spring loaded handle bars determine when you need more power. It really works great, the mower does what I want it to do without me having to think about it. With my previous mower I only could mow a little of the lawn at a time because I was so exhausted from either having to force the shitty thing up hills where it didn't have enough power or got stuck in holes or from being pulled around by the thing faster then I wanted to walk. (It only had one speed). I ran the new one out of gas before I got tired.
My yard is really hilly and bumpy and this thing climbs up steep slopes better then I can so I don't have any complaints with power either. The sales people all enjoyed saying that you could "run behind it" if you wanted...and yes, I tested that out...you can run behind it if you like. Only bad news is the mower was pretty expensive, I paid over $400 for it...but given how terrible a job mowing the lawn with the old mower was compared with this one I feel like it was worth the extra cost.
Edit: Oh, and its RWD and mine came with a bagger and has a mulching option. I just use the side discharge though. I read online that some people think the bag is to small.