when I was at eagle this was the exact situation. 20 guys had ORD and the bottom four were stuck with the CRJ7. No one wanted to touch it with a ten foot pole. Great airplane. Crap trips. Crap schedule. Endless RSV (guys who were in my newhire class of May 07 are just seeing a line, a crap line). I could fit all the airports the RJ went into one small trip book and that was ORD and DFW routes combined. While on RSV they don't use you too much but you can expect to sit ready at the airport for 8 hours at least 2-3 times a week. Thats ONLY if you don't get stuck with an entire months ready schedule. Nothing like going to the airport for a 6am-1pm sit and KNOW you will never do anything more than sit. In short if you can't be sure you will get the ERJ in ORD I would bid BOS and deal with a commute. At least then you know an end is in sight, if you get the CRJ you will have to deal with it until you upgrade or the CRJ goes away.