OP,
Don’t assume that because women outnumber men 3 to 1 that the dating scene will be incredible. I am assuming that you are male (I doubt a woman would describe the potential dating scene at Wells as incredible), but even for a guy, you might be in for a rude awakening, and I don’t say that to be negative. Sure, maybe you meet someone at Wells, but don’t expect the women there to be thinking, “Oooh, there are so few men on campus, so I better grab one!” Wells women might meet someone in Ithaca, just 35-40 minutes away. Or they might already be involved or not interested in getting involved.
That said, even though I’m a big supporter of LACs, I sort of like your other options. SUNY-Binghamton is a nice option (you’ll get used to its drab look). CU-Boulder would be a lot of fun, but how much will it cost for you to attend? If you love Wells, and the price is right, then by all means, attend Wells.
Transferring is a possibility, though you’ll have to really destroy and kick butt academically, plus have some meaningful accomplishments and ECs as a college student to be competitive. Note, too, that lots of schools earmark their strongest financial aid awards for HS seniors, not transfer students. There are exceptions, but these will be schools lower down the totem pole. Note, too, that Ivy League schools and Ivy equivalents will only meet demonstrated need, not a penny more (but they won’t package loans in the deal); elite colleges typically do not offer merit money. But if your family can foot the bill, great.
In general, though, I think it’s best to choose a school without the mindset of transferring. There are exceptions, students who are determined to attend a certain school and will use another school to get there. For the most part, however, you should be choosing a college where you could be happy for four years. Transfers require extra work, extra money, and extra stress. Why go through all that when you can nip things in the bud and simply attend a school you like from the get-go and stay there?
Just my two cents.