Hi Misha @Misha Puskar The size obviously depends on if your Jeep is lifted or not and wheel size. JK comes in both 16" and 17" sizes I believe. As a general advice it's better to keep the current size for tyres to avoid any rubbing issues. For the type, I would recommend that you go for LT (which has 10 ply side wall which will give you more side wall strength) and AT tyres. BFG is standard coming as LT/AT but may be a little heavier for sand. Another favourite in the club is Yocohoma Geolander which comes as LT and non-LT version (the American spec with white writing is LT and without white writing is non-LT). Geo should not cost more than 650-700/ a piece so should be within your budget mentioned.