Sensible or boring as it may sound, I actually avoid oversized (for my needs) equipment.
I tend to shy away from items that get "delivered on a pallet" etc. This isn't just to do with the issues of putting your back out but also of finding shelf space etc. One of the first things I look at when considering a new purchase is the dimensions (including weight) - I look a the physical measurements before the performance ones! This also includes distance from boundary walls when looking at speakers. Even my subwoofer would be categorized as "mini with it's 8 inch driver.
This in part is due to the fact that a) I rent so may have to move house at relative short notice (which happened last year), b) I currently have a smallish living area and don't want it totally dominated by the Hifi, c) I actually prefer the aesthetic of more compact gear - case in point I now have all 3 x components of the T+A 8 Series system, which is approx. half the width of the standard.
I particularly avoid large amps that are deep as well as heavy, mainly as they wouldn't even fit on my shelves. Until a year ago by accommodation was in an attic apartment complete with outdoor spiral staircase as the only access and some years previous to that I lived in a park home (that's basically a static caravan), so all in all I have avoided anything weighing much more than 10kg.
I have still had some good sounding systems and it adds to the challenge when searching out new kit.