HW100 is on my short list too, I've got 3 HW springers (35, 57, 97k) and they are brilliant .22s. I checked out the HW100 a while back but went for a Daystate instead and I dont like it!!! I've also got an S200 mk3 in .177 with 10 shot mag fitted which I use to decafeinate squirrels. Its (reasonably) cheap, well made, light and ridiculously accurate. The mag stopped indexing the rounds once but a couple of drops of oil sorted it out and its not been any problem since.
The power tends to rise a bit as the air pressure goes down so I now put 170 bar in it instead of the recomended 190 bar and