I agree with the above posters and I use GI brass in 9mm, 38 Special, 5.56mm and 7.62 as well as 30/06 and .45ACP.
Case prep is not an issue other than time.
As Ozzie posted above, RCBS markets a swaging die for small pistol and large pistol primer pockets that you use on your press. I use this most of the time.
Lyman markets a case prep kit that uses cutters to remove the crimp and I've found it useful for smaller lots of case prep.
Dillon sells probably the best device extant for their removal, but it's a bit pricy and I've never tried it.
You can even use a pen knife to cut the crimps out. Did this back in my Lee Loader days when living in the barracks. Please don't tell the First Sergeant!
One word of caution with 7.62 and 5.56 brass is that much of it for sale has been fired through machine guns. They are not always easy on brass and I'd be hesitant to buy it without knowing what it was shot through. Of course 9mm doesn't present that problem as most of it was fired through the M9.
US Army Distinguished Rifleman
Washington State Distinguished Rifleman
NRA Police Distinguished Expert