I'd go for an Air Arms tx200.....very well priced (£350-£380) for what (for many) is the absolute pinnacle of spring rifle performance (out of the box)
I preferred my last .22 Tx to a daystate airwolf that i used to own and i'm sure my brand new .177 will be just the same thrill to carry....Some tuners say theres no need to tune these rifles and that is a massive statement when you look at how much the hw fanboys shell out on tuning!
If thats seems a little on the expensive side then as others have pointed out, it will definateley save you from buying twice!