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.