Not sure that 10 is enough!- I'll do my best
1) The king- Crosman 2240. A hobby within a hobby. I defy anyone to say 'It's finished'
2) Crosman 600- nothing more to say- anyone into airpistols MUST HAVE one of these. It's the law!
3) Diana\Original's I have and owned
P5
LP6
Mod 10
Still got them
4) CO2-
Webley MKVI (pellet) very good
Colt SAA (pellet) Excellent
P08 (KWC) utterly superb beyond belief
Colt M1911A1 collectors edition- very nicely detailed pistol- and original Colt walnut grips will fit with a little work
5) sorry but I have to go over 10 -
10m pistols-
other than the Mod10 already mentioned- a special nod to:-
FWB 65
Alpha CO2
Baikal mp-46m
FAS604
And a lot more!