Modchip for 9001 PSX - good place to buy from?

Hi... I would really appreciate it if anyone could tell me of a *trustworthy* place to get a stealth modchip with latest technology that definitely works for a 9001 series PSX.

I recently got one from www.mod-chip.com and after 2 weeks of troubleshooting, it finally worked for 2 hours then died! I tried emailing the site and they did not respond - frankly their customer service sucks big time. They replied quickly the first couple of times, but my last email telling them that their chip is definitely the cause of my problems was ignored.

Any help/advice would be great! Thanks