All of the above is good sound advise.
You need to ask yourself what u want and budget. First thing is what management you require std stuff is good but as above a new loom is a must along with coilpack and lambda control. Aftermarket management will unlock more driveabilty and new car manners and is the best way to go with a borg turbo and manifold

Cheaper old school options are TT.T38.63 AB07 cam 83lb siemens will see over 450bhp with std management and a hart/as inlet. Be sure you have a good quality cooler spec r or proalloy. I use airtec which is good for my needs.

LAST OF ALL PICK A TUNER. DO IT ONCE DO IT RIGHT.........

Regards
Paul