Our second offer came in tonight! It was low, of course, and they were asking for a lot of help in closing costs, so we countered with what we and our realtor deem to be fair. We're hoping that maybe this will be it. My fingers have been crossed all night!
UPDATE (3PM on Friday): We just received a counter offer to our counter offer. It's still kind of a low ball, so we're not going to respond just yet. We have another couple scheduled to view our condo at 5PM today and we want to get their feedback before we proceed. At least this guy got back to us though, unlike the other offer!