First, a couple of observations from what you've said...
Cleaning twice a day is too much, and will be making your rats over-scentmark, and so it's not surprising they will be smelling. Don't clean any cage more than once a week, although toilet corners can be cleaned two or three times.
Any flat surface will attract them to wee on it, so remove all shelves.
If there are any wooden items in the cage, then it's best to coat them with a child safe paint so that they don't absorb anything.
Place a second toilet corner up high next to their favourite bed as an en-suite, and then they will be much more likely to suse it.
Follow those tips whatever cage you end up with, otherwise you'll carry on having problems with smell.
Secondly, the Aurora is the right size cage for a group of 5 - you can get cages which are taller and narrower, but then you have less floorspace, and that's quite an important factor for boys. Other cages with a similar footprint but of different style are:
Savic Zeno 3 empire £99 from Zooplus
Savic Zeno 3 (single level) £125 from Amazon
Mamble 100 (a bit small on its own, but good for 5 if two are joined together) £53 from Little Pet Warehouse
(*discount codes are available)
Coco 100 £60 from Little Pet Warehouse
*FANCYRATS will get you 10% off