The pvr-500 is the obvious choice, basically two 150s on one pcb. I have also heard good things about the new nvidia dual tuner. It is called the DualTV and you can buy it from nvidia's website. The nvidia is a little more expensive. Good luck to you
I am interested in becoming a beta tester I am a beta tester for snapstream (beyond tv) and have a dedicated htpc with a pvr-150 and a pvr-250. I just setup your software for the first time today and really like what I have seen so far. Please let me know if you could use me thanks