It depends on how much the transaction is for. I'm OK with giving $1.00 if what I'm sending is a few hundred dollars. If it's something like signature campaign earnings, I'd be willing to pay a few cents at most. Maybe a dime or so. I like wallets that let you adjust the fees. The blockchain.info wallet sucks ass for just that reason, though I forget what they're charging for a fee.
Actually conversion from btc and dollar have a price diference. It defends on how much you have to exchanges from btc to dollar or local currency but every day the trading wil increase and then decrease. For that purpose, I want fees not too much high or enough to make profit when I want to exchanges to dollar or local currency. Because sometimes I want to buy a bitcoin then I wait to convert until it will increase or to make sure that I have a profit.