Shifter feels rough

[casprog]

Hello all, this is my first post on the forum.

I purchased a 98' Boxster about five months ago ( pics here http://www.imagecubby.com/casprog ) very fun car!

Everything seems great except for the shifting. Every time I shift, it feels rough and clunky. I never experience any problems keeping the car in gear so I'm not sure if it's the clutch or not. It feels just as rough even if the car is off and you just play with the shifter. Also if the car is in neutral, you feel a little resistance moving the shifter left and right.

Could this be linkage or something more serious?

Thanks!