Nobody is going to be able to tell you which is best. That's why there are so many different models, because everybody has different needs. But we can probably at least give some suggestions because this is the internet and we love to give out advice to anybody that'll listen
If it's for studio use, then make your decision on the tone and playability and not cosmetics. So things like finishes, body binding, pick guard, inlays, tuning peg keys, or any other visual element wouldn't be as important to you since this guitar will be heard and not seen for the most part.
Based on that, maybe the Studio, Vintage Mahogany, BFG, or Studio Plus would be a good starting point. These models do away with a lot of the cosmetic appointments and are available at a lower cost.
But really you can't go wrong with a Standard. These retain their value very well, and are a good all-around LP. Even as an LP fan, I do think that the Standards are overpriced by a couple hundred dollars, but if you have the cash they're great guitars.