I think these are a pretty reliable machine.  I had to replace one wheel motor that had a seal start leaking.  Hydraulic oil could leak into the drive chain compartment and overfilled it.  I have replaced one or two drive chains.  I like the XT models for maintenance accessibility.  I can tilt the cab ahead and get to about anything with ease.

Have a 70 and a 90.  Of the things you mentioned, the only one they are possibly a little weak on is the cold starting.   They're fine unaided down to about 20F.  Colder than that is no problem at all if you can plug them in, but probably won't be much fun if it's sitting in a field a mile from electricity.  

60XT isn't quite big enough for large round bales, herbicide shuttles, seed pallets etc.  but if you're just wanting to do 1845C-sized work with a machine that's a little newer and more refined than an 1845C, you'll be pleased. 

I had a 90XT for a number of years, trouble free, hand controls so no friggin computer crap to give troubles plus the 90xt has the bucket cylinders on top of the booms rather than out front so much less apt to damage them if you run into something. I'd like to have one with a cab with heat & air though.

my 2004 90xt has a 2 speed