Kubota M8540HDC, L5740HSTC, BX2200, BX2660, John Deere 425&1025R, Case, Massey Ferguson, Ford
Well since you asked specifically for Kubota, I will stay with that brand and agree with case245 and 94BULLITT and throw in a L5240; don't think the GL60 Series is available yet. Prices are going to vary a great deal between the standard L, Grand L and M Series, so as mentioned; how much you anticipate spending, added features such as HST+ etc, and expected chores will help a lot.
If you are taking about used then more models will be available which are no longer in production like the MX5000, L5030, M5040 and so on.
Sonny, you didn't say HOW MUCH bigger, as in frame size. Are you only looking for more PTO power and a FEL? Or are you looking for something physically bigger?