If this kilt is going to be used as your uniform for piping gigs, and it is to be your only kilt (at least for a while), I'd really reccomend a standard 8 yard knife pleated kilt in heavy weight wool.

When people hire a piper, many times they are hiring a "look" as well as a "sound" and you really want to look the part. Even though I am a huge advocate of the four yard box pleated kilt, and I've made many for pipers, people are more familiar with the look of the 8 yard knife pleated kilt. If it is in your budget, especially since this is going to be your one and only kilt, that's the way I would steer you.

http://giftshop.scottishtartans.org/kilts_8yd.htm

I'd go with the heaviest weight that falls within your budget.