You need to know what you want:
1- 4wd is not needed really unless you live in water logged / snowy parts
2- More power is definitely NOT needed unless you track you car really hard. Heavens, where can you use 355bhp anyway, and can you really control a 911 on a circuit that well to need more power?
3- Same goes for ceramic or sports chassis (-20mm), like the x51, very expensive and only recommended if you are very committed, although I wish I had that exact setup now!
4- short shift, chrono pack and sport exhaust imho is a must whatever you want to do, makes the whole thing feel special. I have sport adaptive seat, but normal sport would be ok for most
5- Sat Nav + bose needed for everyday driving + resale, neither is very good, but this is what Porsche sells you
Now if you really want to track, I would put options in the following order budget wise: sports chassis, ceramics, X51. You would still need chrono, short shift and sport exhaust (this comes standard with X51 btw). Then go to Parr or MJZ and get the suspension geared towards trackdays
My view once again