hi Shags and welcome to auszookers
1)you have to be careful with aircleaners as higher flow = less filtration normally which is bad in a 4wd as they see more dust and stuff, but I have found unifilters to be good, UF190 157S is the part number according to their site and is $80, you can get em at autobarn
2) any good exhaust shop, if they dont do em then they arent good
3) they are short so dont scrimp here or the ride will suffer, some people say OME from ARB is good
4) see 3
5)I know lots of people dont like coopers, for good reasons too, do they make a good year ATR or MTR in that size?