extras are nice but people will up the price they ask for their car.
just try and find the cleanest, well maintainted example you can find within your budget and enjoy.
the more extras you have the more there is likely to go wrong

if you can find a MKIV with xenons you're doing well as they are rarer than a wooden horses excrement (though Ridge being a jammy sod has them!!)
cruise can be retrofitted for around £70 of parts and a little labour.
climate control is more troublesome than manual aircon; have been several cases of the units failing, and the fans failing resulting in big bills! some were done under warranty but its one thing to look out for