To bad the old Nad pp-1 has no mc input.
So I agree wit Viridian go for the Audio-Technica AT440ml I was going to recommend it also, but thought the pp-1 had a mc input. The thing I like about the oc9 is it is much quieter than the Shure v15 in my experience.
You need to get a new cartridge to save your lp's from damage so 88 bucks for the Audio-Technica AT440ml is a good stop gate till you can save up to get a new rig, that would include a new phono that supports low output mc's.
This will be a sizable upgrade in the sound for you.
You will also need a cartridge on this turntable if you plan to sell it when and if you get something different.
Straight out of the box the 440 was great at tracking difficult passages clearly...There was none of the harshness or constrictedness usually associated with an unbroken-in moving coil cartridge. -Absolute Sound Sep/Oct 1994, Vol. 19, #98.
Hi-Fi World Aug 01
Bright, fast sounding and detailed, with fulsome bass.
List Price $219.99
Price: $88.29
http://www.needledoctor.com/s.nl/sc.2/category.363/.f
Cheers
Ron