I was wondering... is better to buy 1 single sitewide link in a big site, high PR and good traffic, or several links in a network (maybe with different IPs) ? What you think is the best strategy from the SEO point of view ?
Depends... Depends on the PR of the big site. Are you looking for traffic? If traffic, I would go with the sitewide. If you are looking to build PR, it would depend on the PR of the network where you are putting the links.
I would suggest you buy different links rather than one sitewide link. It will give you links from different IPs.
yes...agree with most here that better to have several links on different sites than just 1. Same strategy as Investment strategy of diversification...you do not put all your eggs in 1 basket
I like links from as many different IP's ( Class C even) as possible and I use www.receivelinks.com (its free) to accomplish this.