Not a clue on the techie stuff or 0-60 times! but as far as colour goes I'm a bit biased as I have Perf Blue ST hence the name "blueisthecolour" but given a 2nd chance I think I would favour a White with full stripes these look just fantastic but maybe you need to be a bit of a show off you will get lots of attention.
Seats? no need for full on leather unless you really can't live without heated seats & imo they do make the interior dark. the normal 1/2 leather are oh so comfy