For budget you could try www.deepblueaquarium.co.nz online- they do a chineese copy of the eheim 2028. I have one, its quite good quality for the price ($140). Compare that to the equavalent eheim $850.
Its a good unit, reasonably well built, no leaks or problems, and nice and quite too,
Jebao 918
compared with the eheim 2028
Its unlikely to be as long lasting as an eheim, but these are very popular in asia, and reports are pretty good about them.
Im happy with mine!!!