Reduction in offer price?

Hi all, I've been on the verge of putting in an offer over the last couple of weeks. I believe it's a generous offer for the building/neighborhood/size, etc. But now with the way markets have been crumbling, talk of further credit-crisis meltdown, continued rise in oil, hawkish talk from the fed and not to mention rising mortgage rates, I'm guessing I should adjust my offer downward to account for the additional risk and higher debt payment due to higher mortgage rates. How much discount (percentage-wise) do you think is warranted, if any? FYI, my job is secure (as far as I know), my money is in cash or cash equivalents, I can stay in my current apartment at least until Q1-2009 and I'm not very concerned about another buyer coming in. Any thoughts? Much appreciated.