Mastercoin went up to 3X pre-sale price in BTC first week after end of sale, settled down to 2X, then worked its way up to a peak of 25X over the next 6 weeks.
Well if we are going by that model, sellers that can't wait should be selling at more like 0.003 BTC.
Counterparty sounds interesting. Do I understand correctly that all I need to buy it is a bitcoin wallet with which I have control of the private key? I use Multibit. Would this work? If so, I'd like to buy 0.1 BTC worth at 0.003 BTC if anyone is willing.
Oh no, now buyers are gonna start posting offers at 0.003 BTC and I will forever be known as the guy who tanked the price on day 1?
But to answer your question, yes, I believe as long as you have the private key any BTC wallet will work. Now to actually use the XCP, I believe you need the standard bitcoin-qt + counterpartyd software.