Mk1 upgrade

Been looking through other topics over the last few days and I currently have the whole interior out of the car including door cards

Was thinking about upgrading front components I know the sizes which I need however I just don't know which to choose there is that many

Going down the amped with crossovers and speakers in oem places

Can anyone shed some light on a good set even a kit

What kind of rms should I be looking at ?

Should I put a setup together my self or buy as a full kit with everything I need

Looked at a rainbow kit but stated that amp output was only 30w rms which seemed a bit crap

I don't want to spend too much and don't need the best that can be bought

I don't know how much should be spent to get a decent set up either