Last open day, before the summer holidays, I went to Brasenose after spending a day/night at ChCh. For me it just seemed right cant really explain it - more intimate than the expansive Christchurch, great central location right next to the Bodleian and pretty close to the History Faculty too. Also has a pretty decent History library, two nice quad's and pretty reasonable accomadation.
A few people I know have been there, they didnt have too many complaints!
Seems to have a good reputation for Law, History and a few other subjects - and its pretty old too - dont be fooled into thinking the Rad Cam is part of the college - its not, but is always on the front of their prospectus!