I can definitely sympathize with a tight budget and desire to be kilted as soon as possible!

The "PV" kilts from the Scotland Kilt Co are actually 65% viscose rayon, 35% acetate fibre. The material is quite thick and stiff... I don't own one but have handled one and the construction is decent. Apparently they soften up over time. Don't forget that you are likely to get hit with import and sales tax on their package! With today's exchange rate, their package is $143 USD. Shipping free but let's imagine 20% tax... that's $171.6 USD. In Canada, I got hit with 18% duty + 15% sales tax when I imported from them!

My recommendation from your shortlist is the SWK saffron heavyweight. I have one in solid green and think it's pretty great. The wool is softer and lighter than my other wool kilts but it still hangs and swishes well. It kept me plenty warm on a two hour Christmas day walk when the temperature was 4 degrees Celcius. Warmth will be a major consideration for you on St. Pat's, and wool beats PV or acrylic hands down.

You can make your own package from SWK for about the same price as the one you mentioned from the Scotland Kilt Co: heavyweight saffron (comes with flashes), plain black sporran, basic kilt hose, sgian dubh, military safety pin. Total $160.60 USD + shipping.

Happy kilting!