Be aware that if your Kimber Eclipse Custom is a 10mm you might not want to buy a bunch of WC 10mm magazines. I have three WC mags and have feed problems with all three in my Eclipse 10mm. They may work great for you but not for me.
Chip McCormick 8 rd, Metalform 8 rd, MecGar 8 rd, Pachmyer 7 rd, .45 ACP mags in that order. Heck, even the cheap Sarco 7rd .45 ACP mags are pretty darn good! Admittedly haven't used them enough to check the long-term reliability yet, but at least they feed right out of the box! That is more than most (OK, if you HAVE to pin me down, ANY) Kimber mags I've tried. At the risk of being stoned, I was not impressed with the lone Wilson I tried.
Colt "factory-made" magazines are NOT made by Colt! There are at least SIX Colt "factory" made mag makers. Just look at the maker's marks on five of them, and one that is left blank.