So I picked up a 2013 CPO P85+ in the Summer with about 90% of the options available back in 2013 (typical of P85+s as most were fairly loaded). Another local "to be" owner and I PM'd back and forth and he got a 60 for several thousand less. Honestly, between the two cars it comes back to what it always comes back to with EVs right now: range. If you want to take the car out of DFW to Austin, San Antonio, Houston, up to Oklahoma, etc. you are really going to want that extra range (it's a big friggin' state!) - especially if you travel more during the cooler months. Yes, a 60 can "get you" to the Superchargers, but the middling state of destination charging means you may want that extra juice upon arrival, etc. If you are not interested in out of town travel, then a 60 can be an absolute steal and is probably the best deal for the money by far. I mean driving down the road in traffic at 60 mph in a new P100DL and a 2013 Model S 60 are way more similar than different.
As to options, that is mostly personal preference and "nice to haves". If I could have only one different option in my 2013 that was available later it wouldn't be autopilot...it would be the next gen seats. I have gotten used to my gen 1 seats, but it took a while for them to "break me in". The one option I have that I would not do w/o is the red multicoat (I am BIG on getting the exact color you love) followed by leather seats and tech package (the latter more for the power liftgate than anything). Pano roof, UHFS, carbon fiber spoiler, carbon fiber interior trim, 21" rims, etc. (all of which I have) are nice but hardly critical to the experience and in some cases can make it worse (i.e. more noise from pano and larger tires, etc.). Oh, I did forget...I do like the power of the "P" model of course and as a "car guy" I knew I would end up with that, but again, personal preference.