Given the rather modest nature of your friend's system, it doesn't make much sense to spend a lot of money on a phono preamp. However, there are several inexpensive yet decent quality phono preamps, including the Parasound PPH-100 ($120), and the Creek Audio OBH-8MM ($199). Both of these preamps can be purchased from Audio Advisor (www.audioadvisor.com).
Another inexpensive preamp that has gotten good reviews is the Gram Amp (a TAS "Best Buy Recommended Component") that retails for $219. Check the following Web site for info: www.gspaudio.com
If your friend wants something better, then I have two suggestions:
1. a used Lehmann Audio Black Cube, which sells here on A-gon for around $300 (get the original model, not the new one with the enlarged power supply);
2. the Grado PH-1, which sells new for $500, and sells used for $250-300.