Hi guys/gals, new to the site so hello to you all.
Looking to purchase a new airpistol and my wants are as follows:

400-500fps
Lifelike both in weight and looks
Pellet preferred
Blowback

I've been doing a little research (minefield) and have been pointed in the direction of the relatively new (from what I can gather) Sig Sauer X5, pellet/BB 20 round pistol.
Does anyone have any experience with this particular pistol or even have alternative ideas they could mention? Also, pellet calibre, been pointed towards JSB match 7.7gr
Any help appreciated.