Take a look at the GHOBBIES aluminum parts. They are a forum sponsor and I order quite a bit for my revo from them and am extremely satisfied with the quality. You can't beat a lifetime warranty either.
i have aluminum shock caps but that is because mine were messed up when i bought the truck used
the shock ends are a must if you plan to bash hard they tend to bend
also the shock caps IMO are better because they dont have a hole in them like the stockers do which i dont know why the stock ones have it
i bought the shock caps to replace two bad ones and i now ahve 2 more on order
also the shock caps strip easily aluminum does not and its easier to get them tight and they seal better for 10.99 they are a great upgrade
the golden horizons stuff is top notch i will stick with them for all aluminum needs