Welcome to the boards! The more stormies and clones the better!
ATA is really nice looking, screen accurate Stormtrooper armor out of Michigan. It's in the $550-650 range for the complete armor and helmet kit. The downside is the wait-list. 7 to 9 months for the armor. Although, you can order just the helmet kit, have that shipped right away, then be added to the wait-list for the armor. That's what I did.
Troopermaster (TM) is even more accurate than ATA, and ships out the UK. I'm not sure what the wait-list looks like. The downside... more than double the cost of ATA.
As far as clonetrooper kits, KWdesigns are pretty much the cream-of-the-crop! Animated and movie style armor.