Reuniclus is quite good due to the fact that it has magic guard and it's quite bulky. Two sand-summoners is a bit much, so I'd choose one or the other. Golurk and DW gliscor are also quite effective in sandstorm teams. Landorus with choice scarf is a bit like a 2nd excadrill, so not completely necessary. I'd reccomend a level 1 aron with sturdy, endeavor, and a shell bell as a nice, annoying pokemon. Ferrothorn is nice due to its great typing. Any rock types greatly appreciate the 1.5 sp def boost from the sandstorm. Those are the pokemon that I use as part of my sandstorm team as well as some of the ones you mentioned.