It's great to see another fellow predent from Florida.
I agree with what everyone said here, I do believe attending UF undergrad would increase your chance of getting into UFCD. No one knows the exact answer but every year they accept more of their undergrads than any other schools in FL. Is it because of their predents get more opportunities or because the UFCD prefers their own? Well, it's up to your own judgement.
Anyways, I understand you don't wanna waste another semester. So to get into dental school, the most important factors would be your academia, which includes GPA and DAT. Regardless how involved you are or how outstanding your extracurricular is, nothing would matter if you don't have a decent GPA/DAT. So go to a school that offers great BMS/bio program, which would prepare you for the DAT and dental school. All the schools mentioned above are great in this area.
So let's look at which schools offer the most opportunities, besides UF which I know they have wonderful predental clubs (Pre-Dental ASDA and Pre-Dental Society), UCF also has a strong predental club (Pre-Dental Student Association). I'm a fellow predent from UCF, so I can share all the wonderful things with you. In our predental club, we have numerous volunteering programs, which includes free dental clinic, hands-on workshop, and outreach program to underserved areas...etc. Most of the clubs have similar events/activities, but what makes us a bit special is our involvement with ASDA on the local, district and national level. You will see our predents at most of the ASDA events, which has provided us a great networking system. If you want a family oriented, non-competing environment then UCF would be a great fit, regardless of how big the school is.
Since you mentioned you might live on campus, so the cost is probably the same as anywhere else in FL. So to wrap it up, you can't go wrong with any schools. It's totally up to you, how hard are you willing to work to get into dental school is the most important. (If you choose UCF, then look into the biomedical science major, it is quite challenging, but if you can do well in the curriculum, nothing will stop you! DAT will be a breeze!)
Added: If I was in your shoes, I would choose UF if UFCD is your number 1 school. If not, I would choose UCF.