[jwcinpk]

I really don't feel the 20 series offers anything more than a little more comfortable platform and 4 more gears. The only thing I can think of I could use more gears for is tilling. I have the 6000 and the 7010 cab. I've done everything imaginable here on our 172 acre poultry/cattle/goat/tree farm with my 6000. The 7010 only has 50 or so hours on it. The 6000 has been the only tractor for my operation until this winter. I run a Vermeer rebel roller, a fort disc mower, square baler, and countless other implements with the 6000. The loader has plenty of power. Actually sometimes I think too much. I can't count the times I've pulled the back tires off the ground. If all you ever plan to do is roll 4x4's the 5500 will do the job. I have seen a 4500 2wd running a Vermeer roller. The 00 series is sheer bulletproof simplicity at it's best. No electrohydraulic anything to fail. I am a huge fan of that! The 30 series is very similar, they've just moved some things around to improve it a little. They also added some to the price.
The prices you're quoting seem way high. Hopefully a dealer close to you will jump in here with more realistic prices. If not I'd highly recommend another dealer close or even an internet dealer. You could correct a whole lot of problems (if you have them) with the 8-10 grand you'll save.
It's difficult to say what tractor is right for you. I know noone wants a bull in a china shop, but if I had 450 acres I would definately be waiting on the 8560 that's in the pipeline. I feel for that many acres it or atleast a 7520 is warranted. Heck, if they'll ever get that 8560 cab out I might make you a good deal on a 7010. If you feel like the 7520 is too big take a look at the 6500 or 6530.
Like Brandi said make sure you get the skid steer quick attach and atleast 2 rear hydraulics. Easier and cheaper to do it now.