Here are what I come up after going through some discussion here.
Requirement: Use my existing phones and have call ID feature.
Device: Linksys SPA3102 or PAP2T. Seems like SPA3102 has built-in router. My wireless router is not that good. I may consider use it as wireless access point only. Is this right ?
Service: Rynga, Sipgate, Vonage. What else ? Which one is best for bucks ?
Port number: How and where to port my existing home phone number ?