I've got a Rena Aqualife classic 150 x 50 and it is excellent. We've got 2 XP3 filters running and we added an extra Internal (we've got messy plecs). Never had a problem with the XP3's and was surprised at how quiet they are!
I think the Rena tanks are stunning and very well made so if you can get your hands on a cheap second hand one then definitely go for it. You won't be disappointed. IMO they are much, much better then the Juwel tanks, but I only have a small Juwel so it's a bit difficult to compare.