I don't know how much you want to invest in the "ultimate" tractor, but the L4610 is very nice. It's a chunk of change more than the L4310, though - more than I can understand. Still, if it had been available when I bought my L4310HST, I'd have gotten it. (Apparently, not many dealers follow these discussions because not one has responded to my inquiry about pricing or trade-in. I at least thought someone would e-mail me.) The front axle on the L4610 is very nice, and should make steering with heavy loads much easier. The hp increase is negligible, though. The new loader is very nice, with increased capacity and roll back, but they've reduced the reach somewhat to provide greater lift. /w3tcompact/icons/frown.gif The greater hydraulic flow is a needed improvement.
I'd skip the Ag tires completely if you're planning to do much woods work (remember, you can't mix and match between the front and rear without doing your homework because of the lead/lag problem in 4wd), and go with R4s. Now, if you're really searching for the optimum in traction and durability, go with the Michelin XM27 17.5L24's on the rear (or even 19.5's, like I did, but this can cause clearance problems with backhoes and require some reengineering) and 11-16's on the front. There really is no comparison between them and the others. They are an R4 tire with Ag cleat type tread. Very agressive and very tough. I wish Kubota offered them as a factory option.
4-in-1 buckets are heavy - 350lbs is about right for a 5' bucket, I think. But they're worth it, for the "ultimate" tractor. Incredibly more versatile. I know Carver Equipment carried Long, the brand I've got.
What else would you like an opinion on? I got a million of 'em. /w3tcompact/icons/smile.gif