You'll probably need to get another armboard if you want to mount the Rega. Origin Live makes a pre-cut board. I don't think that the Rega arm is much heavier than the Basik, though you'll definitely have to check the Linn's spring adjustment and be careful with the cable dressing (I'll be fitting a Tecnoarm to my LP-12 later this week).
If your P-25 is still running, it might be nice to have two TT's working.....perhaps running a different cart on each? The Basik is not a bad arm at all - but as Viridian has already stated, a bit limited in the choice of suitable carts. A Dynavector 10x5 worked well with my Basik arm. I currently have a Clearaudio Virtuoso on it which is working very nicely.
If your P-25 is still running, it might be nice to have two TT's working.....perhaps running a different cart on each? The Basik is not a bad arm at all - but as Viridian has already stated, a bit limited in the choice of suitable carts. A Dynavector 10x5 worked well with my Basik arm. I currently have a Clearaudio Virtuoso on it which is working very nicely.