I have the kx121 with the 4 way blade. You know these things aren't dozers. You can do a little with them but you run out of umph when trying to do much dozing. I thought about the 6 way and kinda glad I didn't pay extra for it. Thumb and quick tach buckets a must. Go with the 40 the 4k lifting is worth it. Get a 14k dump trailer to haul it around. Works good for me. Good luck.
I've decided on the KX-040 ... now the waiting begins ..... for both the machine and for the snow to melt. I've purchased a used single axle Berkelmans "2 ton Big 'Lil Dumper" hydraulic dump trailer to tow behind my Kubota BX .... I just put new idler hub kits on both sides. Once I get rear remotes installed on the tractor I will officially be ready for the excavator!