My first Turntable... need some suggestions please

The RB300 arm on the Rega Planar 3 is a very good one and can handle the DL103. The main contention with the RB300 is the spring operated tracking force mechanism, which can impart a coloration to the sound of the arm. The best route is to defeat the spring by setting it to 3grams(a factory provided defeat setting) and use the counterweight to set the VTF. Getting one of the aftermarket VTA adjusters is a good idea. Getting a Grado on a Rega is always an iffy proposition due to motor hum near the inner grooves picked up by the Grado. If you want to use Grado on Rega, then get the Origin Live DC motor kit for the P3. No hum, and better sound quality too. This table/cart(DL103) will require a phono section with at least 65db of gain and loadable to 40-100ohms.

Thanks, Jimbo3. Yes I am saying that the DL103 will be a match for the RB300 in both compliance and mass factors. the bearings on the RB300 are upgraded from the ones used on the RB250. I have read that they are the same bearings used on the Linn EKOS. They should be able to handle the DL103 quite nicely. The Rega arms are legendary and for good reason. I use a DL103 with my Origin Live Silver 250 arm, which has even higher quality bearings, and mounts them at wider points in the yoke for even better stablility.