Welcome to XMarks! Looks like you are already getting answers to your questions. Here's a link to a good reference: http://www.clan.com/kiltsandtartan/

You say you are attending a wedding. If it's not your wedding, have you considered renting a formal kilt? (Yes, I know this is heresy. ) If you are in an urban area you may find a kilt shop which will rent formal outfits much like one would rent a tuxedo. This would leave money for the kilts you want and avoid the "bridesmaid dress syndrome."

Since you say you have a lot of time, get your inexpensive kilt first. That way you will gain some familiarity with the kilt before making any major investment.

Also, don't miss the "Kilt Do's and Don'ts" thread - up to 90 pages now!

Keep us informed of your progress. We'll be expecting pictures.