G'day to you sir and welcome from a wild and wet Inverness-shire. I am sure that you have read many of the threads here that contain much fine advice and no doubt others will chip in with more, before long! All I can say is this:-

Do your research , think about it, do more research, think some more and then buy the best kilt that you can afford and if you can't afford it just now, then wait until you can. You will end up with a kilt that will last you for years-------just don't put on/loose any weight----------so take your time deciding.