Remap really depends on what you mean by decat, if you have standard or ppp downpipe youl be ok without a remap although it will make the most of it, has your car got ppp on it?
Panel filter will be fine for you, I'm still running one at 380 no problems. Cosworth also do a good one.
Brembo discs with mintex 1144 pads and goodridge braided hoses was a great cost effective setup on mine, have a word with alum at as performance, great advice and prices. And don't ever go for drilled - dimpled or grooved is the way to go!
And welcome along, whereabouts are you based?