In reply to gnospellius:
Was it the Lachenal Traverse you did? Have you practised crevasse rescue?
From your profile and what you have done I would suggest you are perfectly capable of doing Mt Blanc without a guide.
I suggest you undertake a planned progression of routes, all fun in themselves, and then go for it when you feel confident with your knowledge / skills / fitness and the weather forecast.
A possible and traditional build up could include:
Day 1: To Albert Premier Hut am and practice snow / ice /crevasse skills in the afternoon on the nearby glacier
Day 2: A choice of routes on peaks such as the Aiguille de Tour, Tete Blanche and Petite Fourche. At around 3,500 metres good for acclimatisation. Could spend a couple of days in this area.
After a rest aim for a 4,000 metre peak. Mt Blanc de Tacul normal route is usually straightforward and gives a good view of your objective. There are other nice routes in the area or you could do soe of the routesaround the Torino hut.
You are likely to be ready for Mt Blanc. Choose your route and go for it. Always remember to check the forecast and mountain conditions at the OHM or online - especially avalanche conditions. Get as fit as you can before you go.
Have fun