You are unlikley to get a good venice/san diego now. The Venice did get the highest overclock (the best was the 3000.) The reason for this is, the 3000 was exactly the same as a 3800, just with a different multiplier. So with a good motherboard, and good ram, you will get those insane speeds.
But anyway, now you are unlikley to get them, as a 3000 is designed as a 3000 and so on. So if you are just getting a processor, and want the best one, get the san diego, as it has 1mb of cache where as the venice has 512.
Cisco CCNA, Comptia A+, 1/3 through CCNP