Depends on the types of inbound links coming to those sites. You say mainstream, so I hope you'll be using these domains for mainstream business as well.
Here's the scale I use to assess value in domains:
80% or more of X inbound links with the link text containing the same phrase, definitely buy it.
Lower than 80% and it becomes a judgement call, but at $100 a pop, fuck it, buy them up. A PR=4 basically is a Dmoz/Yahoo listing which costs $600/year now anyways.
The link text is the most crucial part though, if its tons of unrelated text in the link text, then it kinda diminishes the value though.
Hope I was clear above, I've been at the office for 16 hours straight so I'm kinda exhausted...
WG
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I play with Google.
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