For most people, the THD has everything they need in a mainstream HD DVR. The few extras in the original S3 (OLED display, nicer remote, THX certification) is hardly worth double the cost, IMO.
I would buy three TiVoHDs, if I were in your position. You should have no trouble getting cable cards, just explain its for three Series 3 TiVos. They are FCC mandated to provide cards to you.
I would buy three TiVoHDs, if I were in your position. You should have no trouble getting cable cards, just explain its for three Series 3 TiVos. They are FCC mandated to provide cards to you.