I vote for the Umbrella Style line. I can get 4 full loads of laundry on that thing, and I don't have a problem with space at all. I never like the 'T' style lines, I could never get all the clothes that I get on the umbrella one on the 'T' style line. It's just not enough length. And you can put it wherever you want it, just dig a hole and you're done. We rent in a house and DH just rigged it so we could take it with us when we get our first house. I know my parents used cement to anchor theirs, but DH just used the pipe that came with it and reinforced it with the dirt he dug up. It has never bent, or tipped over once and we've had it for a few years now.
Go with the Umbrella Line, you won't be sorry!