Rocket, Pat's right, get the Lundahls. You can have more options available by being able to accomadate low output MCs, but if you wire them direct like I have, you can only do low output MCs unless you take the Lundahls out of the path. Now, that is fine with me, as at this point I have no interest in MM or high output MC, once you get the loading right, there is a certain detailed magic that comes out with low output MC that I have not quite found in MM or high output MC. Like some folks have gone on about how amazing the MM Shure 15 is, and, yup, I have listened to it in a couple systems, and it's nice for sure (pun intended, hardy har har), but IMHO the less costly Denon 103R with proper step-ups betters it a bit. Just an example, the Shure is still a nice cartridge for the price, but....
If you don't want to wire 'em in, you can put 'em in a box with RCA jacks, then you can pop 'em in and out as needed. However, I like the mounting in the chasis deal, as it elimates any problems that could arise with an extra pair of interconnects dealing with the low phono signal. Just short twisted leads from input jack to Lundahls to the Cornet board input. Also, putting the inside the chasis eliminates another thing to squeeze on a rack shelf.