The Core Models that interest you and/or make you want to pick them up and PLAY.
What maybe right for me, could be very different from you and as its 'your' money, you that has to live with your choice and you that will be playing it, it has to work for you. It doesn't matter what anyone else 'thinks', they are NOT you, not got your hands etc to feel what you 'feel' when playing, can't hear what you hear, not going to have the same 'preferences'.
Therefore, you should get out there and try guitars. If they make you want to pick them up and try in a Shop, then its a good start. If you can't put it down, or can't stop thinking about it and trying other guitars just makes you want that one, then you KNOW that is the Guitar for you - whether it's a PRS or not, whether it's a Core, S2 or SE - it's the right guitar for you.
Only when you know what you like/prefer, how things feel/play, what features/specs you want/need etc can you really consider buying 'blind' as such (or don't mind buying to try and flipping if its not for you). Whatever 'Core' model you are considering, they are going to be a very high quality, exceptional example of that model - but whether it 'works' for you or not, only you can decide.
Really, no-one can tell you what you should/shouldn't buy with your money and what will 'work' for you because they are not you. I don't know anyone here that will tell you you have made a 'bad' choice whatever PRS you buy, as long as you are happy and it works for you, that's all that matters.