Another turntable that need no modification and ready to accommodate 2 tonearms of any size (from 9inch to 12 inch) is the Luxman PD-444 direct drive. I think the price is under $2500 + tonearm of your choice. Motor made by Micro Seiki. I use two of them on my custom made racks, very happy about the quality of LUX. Technics Sp10mkII has been moved aside, and Victor TT-101 waiting in the line. Luxman is a top quality turntable, superheavy, great design. I think for $2500 it will be hart to find anything better, especially for two tonearms (if needed).
More info: http://www.thevintageknob.org/luxman-PD444.html
More info: http://www.thevintageknob.org/luxman-PD444.html