From what I've seen, Belgian Strong Ale's are at, or below, 3.0 CO2 volumes... Why are you looking to go all the way up to 4.0 CO2 volumes? Belgian Lambic brews go up to about 4.5 CO2 volumes, but that's not what you're said you're looking to brew.
If you remain within the style range for the Belgian Strong Ale's, pretty much any bottle will do. If you want to do a Lambic, I would suggest going with actual Belgian bottles, corks and cages (you'll need a corker to do that)...
I went with the Belgian bottles for my BarleyWine that I bottled up last weekend. Using a floor corker (not a champagne style) it went pretty well. You just need to be careful, and set the plunger depth so that you leave enough of the cork outside the bottle (but not too much) for the cage to go onto. I do need to get the wire tool for the cages before I use those types of bottles again. I'm actually looking to use them for an old ale I have aging on some oak... I think it adds a touch of class to the presentation of the brew... :rockin: