John,
Are they offering the 6.9% on the 5105? I have the 5205 version w/loader. I understand you can have the dealer adjust the injection pump and bring it up to a real 48 PTO HP (even beyond!). The 5105 is identical to the 5205 set up for 40 vs 48 hp (pto).
If the price you mentioned is for new, then it's great... you can never have enough horsepower or traction.... Actually that engine tweaked will do 53 PTO HP and run all day long!
The 521 loader will lift 2100 lbs vs the 460 loader @ 1700 lbs. The 4000 series catalog shows a "higher" lift capacity, but it's a misprint. Also on the 521 loader, you can change the position of the lift cylinders to increase lift to 2500 lbs and change the maximum lift ht (though not recommended for the 5n05 series... safety issue?)
I really love the shuttle shift on the 5n05 series, very nice and fast for loader work or quick forward and reverse motions. With 17.4 gpm hydraulic flow rate, the loader is FAST! FAST UP, FAST Dump,,, Did I mention the loader was F-a-s-t!
I plow a mall parking lot with my unit, put the loader bucket in "float" position, have a 8' Heavy duty rear blade (also in float position) and move literally ton's of snow fast. Did I mention FAST... Ooops getting carried away again... The MFWD could climb up a wall (if gravity wouldn't tip it over)
For only a couple thousand difference, I think it's a no brainer for the 5n05 unit. That tractor is a real sleeper and bargain for that price.
Good luck John!