I absolutely love my Maclaren Triumph. I have never found it bulky or heavy and I have major back issues. I especially love the strap I can carry it with. I even tracked down a double Maclaren now that I'm expecting twins. It's such a sturdy, easy to push/turn/set up/close down stroller, and has worked wonderful these last 2 1/2 years (many plane rides, museums, zoos, etc)
I'm sorry it was confusing to assemble, I purchased mine at a store, already assembled.
I purchased this stroller because of my height (5'10") back issues, my small trunk, the up and reclining positions, and my daughters who are 4 years apart. The stroller can hold up to 55 lbs, which, I think, was 15 more than the Combi. My daughter just turned 7 and is now growing out of it. It has been great for her to use it once in a while. (I also love the rain/wind guard).
I guess I am encouraging you to look at the Triumph again. Can you pay them to assemble it? Find it locally and have the store associates assemble it?
Good luck!