Whats a good amount of link backs to start getting better PR?

[john0pr0n0]

Just wondering, what would be a good amount of link backs to aim for, to build a page with decent PR ?

I understand the better ranked pages linking back means alot along with being relevent to your own page, what i am wondering is am i giong to need like 2.5 million link backs like sex.com appears to have?

What do would most sites have? such as the hun, shemp, or other bigger sites?

I just want to get an idea of what i should be aiming for!

Any info about this would be much appreciated!