I once wanted to download CounterParty and it needed a full bitcoin node. They're neat technology but they are hamstrung by their reliance on Bitcoin IMO. I agree, if you have to rely on any currency it is best BTC.
Just for your future reference the new Counterwallet is hands down the easiest wallet software I've ever seen. You can create assets for a fraction of the cost of NXT and the idea of being able to trade anything for anything seems to be a bit more doable there.
Having your username be the password is a pretty awesome idea even if its 12 words long.
From what I've read Bitshares is taking the idea of implementing crypto in real-world business to a whole new level, but all 3 platforms are elevating the reputation of the alt scene by succeeding at being innovative, IMHO.