Have a look at the BSA ultra or scorpion both very , very good guns and even more after they have been regged by XTX AIR
If you have the money go for HW100KT in any cal,these are already regged, as you can see this is a HW100 forum now
IMO do not touch daystate ,over rated ,over priced crap
AA s410 is a cracking good gun as well ,but not regged ,i just prefer regged guns , no sweet spots ,no power curves.
My chose would be HW100k or kt and thats why i have two of them ,one in .177 and .22 love them both