I just got the 43 right after Christmas and I like it too much to get rid of it. My CC balance was less than what I paid for it, to begin with. I have put part of the money from the sale of my Tammy 18-250 towards the balance (I used most of the rest of the money to pick up a F70-210 to replace the 18-250), so that knocked it down significantly.
I went on ahead and decided to sell the 50. I posted it on this forum and got $25 for it, which is more than I would've gotten if I had put it up on Fleabay, most likely. In addition to to the lenses, thus far, I've sold a couple of camera bags and some of my books on half.com. Once I actually pay Discover with what I've made so far, my balance should be down to $78 + change. Obviously, it didn't start out as a huge balance to begin with, but it's just been bugging me.
At this point, I think my next lens purchase is going to be the 21, which I will start saving up for once the CC is paid off. I've still got a $100 rebate coming from Pentax for the 43, which I should get sometime in mid February, so that'll make a nice addition to the lens fund.
Once the 70-210 comes, then I've got yet another lens I can dump--a Sigma 28-210/3.5-4.5, which I'll probably put $50 on.
Anyhow, that's my plan.
Heather