I've got a Maclaren XLR and have used it from when DD was born - she's now 19 months. I really like it, and didn't feel it was too bone-shakey - there's suspension in the wheels and the padding it comes with is comfy. There wasn't a carrycot when we got ours, but that sounds like a good addition. I used it with the carseat until she was about four months, but didn't realise you can adjust the carseat, so it probably could have been longer, except she was never that keen on being in it. At the beginning it did feel like she was a bit vulnerable lying flat with nothing on the front of the pushchair, but I got a cheapo cosytoes from TKMaxx and that made me feel happier with it. This winter she's used the big footmuff it comes with.
I don't drive and live in London, and I would say the XLR's done at least a mile of walking every day for the last 18 months. I went on the tube, trains and buses with it from when DD was about two weeks old and never had any insurmountable problems. I've had the brake discs replaced, which cost £15, and DD's been fighting the hood so the plastic's torn now. But it's been great, all in all, pretty light, very manoeverable around shops, and on buses (split handles very useful on buses, incidentally, so that you can get them either side of a pole and put the pushchair into a smaller space). All the bits are easily removed and machine-washable. I still put it flat when DD falls asleep, although she can sleep less reclined.
Only downsides are that it's only rear-facing with the carseat, and I think I would have liked to see her more when she was little, although she didn't seem bothered. And that when the seat's flat it's tricky getting into the basket, but I think that must be a problem with all the pushchairs of that design.
as nicolamumof3 says, depends what you want it for really. Despite all that, I've recently bought a cheap Tesco stroller to pop to the park or playgroup in, and we use the XLR when we're out for longer, or I'll have more to schlep home. Chances are that even if you get it you'll want something smaller when your baby's a toddler anyway but, as I say, we've been really happy with the XLR and it definitely let me get about more easily than friends who had really massive heavy travel systems.
Other one you could look at is a Bugaboo Bee - I know a couple of people who have been really happy with theirs and you can flip it round to be front or rear facing. More money though. And when we were looking I thought it would be too small fairly quickly, whereas the XLR still has lots of room for our enormous offspring - but perhaps you are more reasonably sized than we are!