Hi,
Keep away from the slr98,way over priced gun and you can catch them used on gun trader for 300 ish,google gun trader and have a look on there as prices on new Rifles vary threw different dealer,you will tell which is taking the p and which aint.
I would look towards a bsa lightning or theoben evolution,the evolution is around 370 and has a gas ram so noworry about the spring braking,the lightning is a springer and you can add a gas ram,lightning price is around 190-250 dependant on which model you go for,gas ram can be brought for around 50-60.
I would opt for 177 too for flater pellet