I personally would never get a pair of Lunar's as actual running shoes (aside from the Racers). I think they look good and I like wearing them around, but would never wear them to actually run in. They're more like toys than running shoes (with the flywire and lunar foam). If your stuck on getting Nike, get the Triax, I ran in them for many years and I liked them. I have recently switched to the Brooks Ravennas. The Ravennas are a little bit more flexible and light. Also, I always felt that Nike's running shoes were bulky, despite the weight. I don't know why, they just seem that way to me. I know many people that ran in Nike and switched to Brooks after trying on some Ravennas.
Go to a running store and try all the shoes similar to the 2150 (normal arch and mild support for overpronation). I tried the 2150's, Keyanos, Nike Triax, Nike Equalon, Brooks Adrenaline, Saucony's (Cant remember the specific name), and then the Brooks Ravenna, once I put them on, I knew they were the best shoe I'd ever tried!