I can't say I've ever tried them but from what I've heard the ebay projectors aren't the greatest thing. It is your money but I'm just going off of what I've heard.
As far as the tails though I'd first try to dry them out really good and then seal them up as best as you can. I did this to mine and I got the one sealed up nicely but the other one didn't work as well. I'd personally like to get a set of taillights but for now I'll just deal with it. If the drying/sealing doesn't work for you though (again) it's your money and you can do whatever suits your desires. I think LED tails look sexy as h311 but that's just my opinion, do whatever you want to.