That is an interesting concept and worth thinking about: to spend bitcoin as a means of increasing your other bitcoins value...
What is your opinion about alt-coins? I see you have some SXC... what value does SexCoin offer ? Was that donated to you as well ?
I personally have used my initial bitcoin investment from a year ago to get into LTC, WDC, QRK, DOGE, PPC... I see potential mostly in all those except DOGE. DOGE I hold just because it's a childish fad and sometimes childish fads are worth a lot of money (lol).
Any ideas on which coins you find the most potential in?
Yes, I believe trading is the blood of bitcoin. Can't have a strong and functional system without a strong blood flow.
Like with anything else there will be alternatives and bitcoin is no different. I have a litecoin wallet but have not movement there. As fast as sxc coins, I believe this has a strong future if managed and advertised well. Think about it, sex is 3/4 of the total internet usage. There is a huge need for this currency. And in my opinion sxc coins should have a value and weight of its own. Unattached to the rest because they fill a very specific purpose. I think people may be willing to pay more for sxc than for Bitcoins in the future. Well, that may sound crazy.
I looked into doge but I really have no interest in following. It may be the next thing just because of the hype like you said. But I don't feel like keeping an eye on it.
So my list is BTC, SXC, then LTC.