djayers1
I assume that the Oxigen 61 does (velocity sensitive keys with after touch)?
I have the Oxygen 61 and it does have velocity sensitive keys with after touch. Very nice controller, especially for the price, but not weighted.
You tend to pay quite a bit more for real weighted action, and you really do get what you pay for in this respect.
I have heard very good things about the Oxygen 88 which is weighted action and reasonably priced -
http://www.musiciansfriend.com/keyboards-midi/m-audio-oxygen-88-midi-controller#review I have an older Casio 88 key hammer action controller that is ok, but not really "piano" action either - If you really want piano action, I think it is important to try them out for yourself before you buy, as it really makes a big difference. Hopefully something you'll live with for a while. That said, I use it exclusively for piano samples in Kontakt or True Pianos. In my opinion you can't play non-electric piano with a synth action keyboard.
That said - I like the oxygen 61 for what it is. I wore one out (the older series 61) a year or so ago, and liked it so much I bought another one. The new series is lighter and less robust but has stood up well. It is my primary controller for all of my synths (I also have a 25 key Novation).
Hope this helps.