I may pick up a refurb 1.83 mini or just punt on the whole mini idea & get a MacBook. I guess I'm just setting my decision date at WWDC. Sick of waiting.
Based on what I've seen in the past year or two, I'd recommend setting your give up date to 1 month after WWDC. Macbook Pro refreshes weren't announced at Macworld Expo 2008 but a little over a month later, there they were. Keep in mind that the rumors were getting stronger and stronger each week though so I imagine if anything is to come with the Mac Mini, you'll know within the first few weeks after WWDC which is why I would set the give up date to a month after WWDC. By then, if the rumors haven't picked up strongly with very good signs pointing to an upgrade, I would just make the purchase based on what is currently available.