Yeah, the Tumi's always cost a premium price. I personally have found the design of Tumi a little "busy" for my taste - I prefer the B&R cleaner lines.

The Eagle Creek rolling tote you mention would definitely work. But to be picky about it, that bag is more of a front loading bag than a top loading bag, and it's hard to tell from the photos if the top of the bag has a slope that might make balancing another bag on top of it difficult. Also, it's hard to tell if the bag is very soft-sided, such that it might collapse a bit when another bag is placed on top of it - the B&R seems to have a bit of structure to it that helps it retain it's shape even when another bag is balanced on top. On the other hand, my B&R is usually filled up enough that he inner contents makes the bag keeps it's structure, and there's no reason to think the Eagle Creek wouldn't do the same.

Again, I should point out that most of the luggage companies design these totes with the idea that the tote will go on top of another rolling suitcase. Whereas I am using the tote as my only roller - I use another, non-wheeled bag for the rest of my luggage. If you do any research on "one bag" travelling, you'll understand that non-wheeled bags have by far the most packing room per size of bag. By using a small tote with wheels, and another non-wheeled bag, I can pack as much stuff as I'd ever need for any trip, yet don't have to manually carry my luggage (which is what you have to do with true one-bag travel), and I still NEVER have to check a bag, since I can fit both bags in an overhead bin or under my seat. Never checking a bag means I never spend time waiting at the baggage carousel, and I never have lost luggage.

One final point: whenever I've had any issue with my B&R bags (I own multiple different ones), I take it to my local luggage shop who handles the B&R repairs, and the guy fixes it and gives it back to me, and no money ever changes hands. It's awesome.