hi Duggan, went through this myself not so long back, couple of bits i found out!
Find out the max and min travel your frame will support – too much and it climbs awfully (i switched to a 120mm fork and it ruined the bike!)
2nd hand forks are well worth a look – you’ll get loads more for your money, and it does make a difference to the bike.
If you can find a pair, i’d highly recommend the rockshox rebas – switched to these on my old bike and the change was stunning.
If you want an uber cheap 2nd hand set – i have a set of Tora 302’s? Bit of damage to the paintwork but otherwise sound.