In other grant thoughts for the morning, what are other NSFers putting in their travel budgets for conference travel. When I first started writing grants, someone told me it was normal to add $1K for a domestic conference and $2K for a foreign one. More recently I've realized that I can't walk out the door for less than about $1.5K and if I'm going overseas, we're talking at least $3k, but that's pushing it. Airfare is up and housing is often pricey. Add registration costs, etc., and the costs mount.
So I decided to adjust my budget accordingly in some recent grants. I colleague of mine actually noticed the increase when I asked the to take a quick look over the proposal and remarked that reviewers might think that was too much.
In various ways I have seen this type of thing manifest itself - "the cost of X must be $Y or else reviewers will baulk". But what if the cost of X is much greater than $Y? My opinion is that a couple of grand here or there in a grant budget is small change that no one should care about (hell, you could rebudget later if needed anyway), but this I've seen this type of reaction enough to be concerned about it in the review process.
So ask the NSFers among you, what are budgeting for travel? Has a reviewer ever remarked on that portion of your budget?