I would caution against using mousse (mousses?) if you do a lot of road work, they can overheat and break up. Also you are stuck with a single tyre pressure (although without the same danger of puncture if running "low" pressures).
Heavy Duty tubes are also not recommended for road use (also because of potential overheating) but I use them without any proplems, although i do pump the tyres up hard for long road miles. Although saying that the other week I rode 50miles back from Thetford at 60-70mph (mostly dual carriageways) with only 15psi in the tyres and so far no problems.
I carry a 21" tube, three tyre levers, tools for wheel removal and a small bottle of shampoo/shower gel (the ones they give away in hotels), CO2 canisters and a mountain bike pump.
And for punctures at the end of the day when you can't be bothered and want to go home..... an RAC Membership card