The Sumiko doesn't produce enough output when paired with my McIntosh MX-119 -- I had to raise the volume control to 70 or 80 for "room filling" sound (classical music). It's also a lousy sounding, poor-tracking cartridge, not fit for a turntable as well-build as the MT-5. After listening to the MT-5/BluePoint <--> MX-119 combo for a few days (and being disgusted at how much money I wasted on the MT-5), I put in the Ortofon 2M-Bronze cartridge that I used successfully in my old Linn-Sondek (1980's vintage) turntable. It really made the MT-5 sound fabulous and made me very happy that I purchased the MT-5. First of all, the higher-output 2M-Bronze allowed me to listen at volume level 35 or 40 (versus 70 or 80 for the Blue-Point). Secondly, the Ortofon brought out the superb sound that the MT-5 is capable of producing (and showed the MT-5 to be a vast improvement over my old Linn-Sondek turntable).
I listen mostly to classical records and have a huge collection of old RCA, London-Decca, Columbia Masterworks, and Mercury LP's. The MT-5/Ortofon brought out nuances that I never heard before in some of my records. Mono records especially benefited from the new MT-5/Ortofon (over the Linn/Ortofon). You could actually imagine sitting in the 20th row of Orchestra Hall on the 6 Rafael Kubelik/Chicago Symphony Mercury mono LP's (from an early 70's reissue box set). The MT-5/Ortofon was much more focused and produced a better stereo image when A/B'd against the Linn/Ortofon combination.
Make sure to NEVER pay full price for the MT-5. I paid about $5800 with tax for mine. I've had it for about 6 months now and am thrilled with it with the Ortofon.
I would definitely IMMEDIATELY replace the Sumiko Blue Point if you're going to buy the MT-5. I wish that McIntosh would reduce the price of the MT-5 by a couple of hundred dollars and leave off the miserable cartridge that they put on it.
If you live in the South Bend, IN area, you're certainly welcome to come over and listen to mine. I also have the proper setup tools (that you're welcome to borrow if you live locally) to really make the MT-5 sound its best -- I used the Feikert Alignment Tool to setup the cartridge geometry (luckily, the MT-5 has a precise 3D "dot" at the pivot point of the tonearm -- essential for getting the cartridge overhang set correctly) and the Fosgate Fozgometer for setting azimuth (essential for playing stereo records perfectly).