Better get the PS3 unit from the local Sony stores. It will cost more but you will be covered with 1 year warranty (more expensive by 2 to 3k). Datablitz sells dirt cheap PS3s pero in most cases will not honor your unit's warranty or will give you a hard time before they do repair the unit (based on experiences on another playstation forum) The PS3 is an awesome entertainment system and is tougher than an XBOX 360 but is not free from defects (YLOD, Blu ray malfunction etc...). A good warranty should protect your investment in case anything happens.
The jailbreak thing is really a choice of the buyer but in case you are a gaming person being legit is the way to go. Its the only way to play online... free (to boot) on the PSN. Once you've tried online gaming you will be hooked. I've tried and i never played 2k11 and Super Street Fighter IV offline again.