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It really shouldn't make that much of a difference, and the inbound links will do far more good than you'll lose from linking to some quality sites from just one page.
If you are after a ranking increase the links may or may not help depending on their quality, their relation to your site topic, and if you get anyone to reciprocate.
I would not worry at all about losing PR for putting up a links page. These days PR is much lees important than it was.