also i can confirm that the 901 does have barrel supports as i had daisy send me a diagram and the supports are there. the 901 is only around $25 more than an 880, the better stock and barrel supports and the better front sight is worth it to me.
I would expect the Daisy 901 to be significantly more powerful than the Crosman 2100, simply because every Daisy 880 that I have shot is much more powerful than ANY Crosman 2100 that I have EVER used, and the Daisy 880 and 901 share the same exact power plant.