Go for the Rift but wait for the consumer version. I've had several opportunities to try it out and it's not like that 3D .
VR isn't a gimmick, it's a brilliant innovation that allows for an amazing range of possibilities and experiences.
A little anecdote: Me and a few friends went to the last PAX Aus. The queue for the Rift booth was unsurprisingly huge, but of course the obvious solution is to go hunt for little indie booths that had the Rift. Soon enough we found one with a two-player spaceflight arcadey shooter thing, and a horror game. While I waited to secure a chance to try the spacefighter game, my friend sat down to try the horror game. About 30 seconds after he'd sat down with the Rift on, he got up and joined me again. When I asked what was wrong he said "I didn't want to move, it was too immersive".