No love for Glennon? I am on record as wishing we traded for him last year - that way we could "try before you buy".
I haven't given the salary cap a lot of thought, but if we could sign Glennon to a reasonable deal* without totally limiting us in free agency, I'd prefer that route. But if we're screwed with the cap then, as much as I'd hate to do it, it does make sense to trade for Jimmy because he's really cheap (on his rookie contract) thus it would offset Brock's contract. The problem with this is that he'll be a free agent at the end of the year, so we'd have to make a decision to offer him an extension that doesn't impact the 2017 cap much or, if we're feeling gun shy, see how he does and pay out the nose if he does well.
The other option I like is Romo but would not trade for him. The Cowboys are going to have to release him plus we can't afford his current salary. Our only hope is signing him as a FA to a reasonable contract. If he wants to win, we have to be on his short list.
I'd also be down with Tyrod Taylor, but I'm not sure if he'll be cut or if he'll be cheap enough for us.
*There's talk of him getting $13M-$15M per year, but I'm not so sure about that. If Tyrod, Kaepernick, and Cutler are all available (and Garopollo is actually traded) then I'd have to think that would come pretty close to saturating the market (plus there's been some talk of Chicago rolling with Hoyer next year). I know it sounds crazy to use the term saturated market in such a QB-needy league, but on a relative scale it does appear to be. Had Brock been a FA in 2017 with his resume through 2015 (i.e. before everyone knew for a fact he was awful) there's no way in hell he'd get that contract. Just too much competition. He really hit the market at the perfect time last year. Same with Fitzpatrick. The Jets would've let him walk if they had all these options.
Teams looking for a QB: Buf, NYJ, Hou, Cle, SF, Chi. Available QBs: Tyrod, Romo, Cutler, Kaep, Glennon, Hoyer. If any of those teams decide to go rookie then there will be a decent FA QB looking for a home. The only QB I really, really don't want is Kaepernick.