We use the Quinny Zapp with the Maxi Cosi car seat and really like it. The frame is easy to fold and does not take up much space when it is folded. It is not the sturdiest of strollers (although to me, it seems stronger than the lightweight Combi strollers, for example) but I like the fact that it's light enough that I can carry it down steps, if necessary. We bought ours overseas so it was cheaper than in HK, but I think it is less than HK$3000 at Mothercare.
The only thing that I dislike about my Zapp is that the seat that comes with it does not recline, although I think the newest style does have a reclining seat. We bought a 2nd stroller to deal with this - if you already have a Maclaren, then this isn't really a problem.