I have 95cm just a bit further North than you. Only a 0.2 or 0.3db LNB (can never remember what was fitted!) not one of those highly recommended (from German website) Megasat Diavolo Twin 0.1dB LNBs.
And I can't get 7W (will be fitting my bigger dish soon). Bigger is better as far as dish size is concerned but 80cm should get you most things with a 0.2db LNB, might struggle with 4W, 12.5W, 11W, 31.5W (and prob wont geat some weaker 1W transponders) etc