Woah There!
Some not great advice here folks!
1. DO NOT put a 180 or 160 mm fork in this frame – it won’t be rated for it and it could be very dangerous. Stick to 140mm and below
2. Check your wheels, I suspect you’ll have a 9mm QR hub on there and buying a fork with a through axle will mean a new hub/wheel (that said a new set of wheels would prob do as much for the bike as new forks)
3. Get your headset replaced when you buy the new forks (Get your LBS to do this – but don’t ask them to fit the fork, they’ll likely be offended if you bought it online!)
4. If you’re not sure about cutting down the steere etc get advice on here first.
CRC or Merlin or JE James etc normally have good buys, I reckon a RS revelation or sektor/MZ44 would suit the job pretty well.