This might not be the best thing to do, who knows, but if I were in your situation I'd pay about $350 on the CC, and buy your konis with your debit. Then if you have more money next month pay about $100 on the CC. Then buy more stuff on the CC, pay a little more than min. payment the next month, then buy more and make a big payment. Sounds weird, but that's what usually happens with me and my CCs. I have two, one with a 2k limit, and another with a $500 limit. I am car shopping and recently got approved for a $8000 loan with only $1000 down and I'm 20. It took a few places though to get approved. My beacon credit score is 680, which is decent, and experian figured it out as 706 which is good. I've had two late payments in the two years I've had the cards. Mix it up a bit, but don't buy stuff and pay it all the way off. Others may disagree.
~Paul