I studied Biomed at Warwick for a year before I decided to change course, but don't let that put you off, it just wasn't the right subject for me. What I would say is that, despite it's rankings for Biology, the Biomed course at Warwick is still very good; you get a lot more contact hours than you would for many courses, the standard of teaching was fairly good (compared to some modules I've been taught in WBS since) and, in my experience, the staff were always helpful and friendly and really approachable. Some of the postgrads helping out in labs were a little difficult at times, but as these change each year you might not have this problem.
I can understand you wanting to aim high, but Warwick, overall, is a very good university and ultimately, I'd say you should be aiming to go somewhere you think you'll be happy. You said you love the uni, so that's a very good sign! I know when I first went to an open day I fell in love with the place and can honestly say I've had the best time there; I love the campus the people and the SU and it's societies are outstanding.
While the course is obviously very important, I'd say when making your decision try and choose somewhere that you know you'll be happy and enjoy spending the next 3 years of your life.