Andrew Voss, one of the club members has grown neomexicanus in his hop yard. He has not been around much lately but I would wonder if he still has some sitting around. I know he has scaled back his operation recently but I would bet he still has stock.
From the experiments that came out of his crop I seem to remember really bright citrus flavors and a lemony finish. As these were whole hops that were also quite small we did have to used a lot of them to get these flavors out of them.
As for amarillo and el dorado, I have used this extensively over the last few years in my IPA’s and almost feel that there is no way to go wrong with these varieties for late additions in your IPA’s. They give some amazing fruity, citrus, and floral aromas that make for some amazing beer. I have found that other hops like, citra, simcoe and mosaic can be also nice compliments to these hops.