If you play EVE, pay with time cards. Especially if you’re European. Basically it comes down to the US$/€ exchange rate. I also happen to be part of an affiliate scheme selling them through Shattered Crystal, but even if I wasn’t, I’d tell you anyway (in fact I waited a little longer to post this while I found a good affiliate scheme :P).
I’ve explained the whole exchange rate thing a bit better as well as given more info about Shattered Crystal on my EVE Online Time Cards page.