Pinny/BetCRIS/whoever offers overnights is a must-have if you have time to take a look at them before bed.
I love Skybook for the free 1/2, but I don't think it's applicable for people who bet more than $300 on the game? Not sure about that, but I think it's somewhere between $300-$500. Only problem is Skybook takes their sweetass time putting lines up (not till like noon or 1 PM EST, if I'm not mistaken?) and I personally enjoy hitting overnights if something jumps out at me. But I still really like them.
Then again, I'm far less experienced and generally have no idea what the fuck I'm talking about, so take my opinions with a grain of salt.
Someone like DAWOOF could provide valuable insight on this question. Hopefully one of them will respond.
Mansion looks dead for O/N's. There's a line, but the base is -110 for about 4k, the amount is fine for me, not the juice. Looks you'll have to have Pinny, and somebody else when Pinny is over -110. I'm thinking along the lines of CRIS,Jam, Greek, and look at the exchanges, but don't expect to find much overnite at an exchange.
Sky should be at $300 limit for the half point free. Late bettors will probably find exchanges useful.