Stiffen up!

I'd start with the cheapest thing first and replace them one at a time. You could well go the mk2 shock route as by all accounts they work well providing you're happy with that, instead of going the coilover option. Would you be doing all the spannering yourself?
I did the front chassis brace first, then the cabin brace, Meisters, geo alignment, OEM strut brace (not sure it does a thing actually but sets the bay off) and finally frame rails (yet to fit).
The difference to the quality of the ride after the Meisters was night and day. No more crashy, crashy over bumps - did the job beautifully...