Bugaboo Chameleon all the way!
I've had (in the past) Mamas and Papas Pliko (rubbish), Graco (rubbish), Mamas and Papas MPX travel system (carrycot big and fantastic system for first 6 months but after that the pushchair seat is awkward and uncomfy). Bought the Chameleon instead as DD refused to get in the Mamas and Papas in the end she hated it so much!
Mamas and papas are quite flimsy, plasticky and not very good if something goes wrong. Both my prams from M&P had wobbly handles and bits that fell off/broke just AFTER the guarantee ran out!!! Hmmmm.
Love, love love my bugaboo. My only criticism (and this is a tiny thing) is that the small wheels do get clogged by mud. But I don't walk thro mud that often. Also not good for public transport as it doesn't fold in one piece (but again I use the car and just sling it in the boot. Most of the time I don't bother folding it up, just take the seat bit off and sling it in). DD loves it, so comfy, stylish, EASY to push with one hand, very light to push. Seat faces both ways, lies flat for comfy sleep and a big generous hood which is really cosy. Also can buy fabrics in different colours if you get bored with your original choice. Fabulous. Wish I'd bought one years ago and not wasted my money on all the rest!
The only other one I've had that was good when DD1 was older was a McLaren which we still use for holidays (flying etc you need one that folds in one piece). Can pick up a McLaren quite cheap though when your DC is older if you want one as well as your main pram. (Got mine in John Lewis sale for about £40 and that was 7 yrs ago - still use it occasionally!!)
Am pg now with DC3 and have no intention of looking for another pram (odd for me as I'm a pram addict!). I might change my fabrics for another colour but that;s it!
Good luck. Go and try out lots and read reviews of them online.