I have six of the Manfrotto ####BAC stands (a pair each of the 1004, 1051, and 1052), and they're great. They fold flat (vs 'round' like tripods and typical light stands) and stands of the same size lock together when folded.
The key considerations are height, load capacity, and footprint diameter. Of those, I've found that I don't pay much attention to load - the 1004 is rated for 20 lbs, I've had 30 lbs at least (boom with counterweight and heavy monolight/softbox which also exceeded the boom's rating).
I like the 1051 for indoor use, because of the small footprint. I typically use it with a 600EX-RT in a Lastolite 24" Ezybox. That's a fairly heavy modifier, but no problem on the 1051. An umbrella with 2-3 Speedlites would be fine. But, outdoors it'd be likely to blow over in a breeze, even with the legs sandbagged - the larger footprint of the 1052 is an advantage there (still need sandbags).
Also consider if a 9' stand will be enough outdoors. The closed length of the 12' stand (1004) is only 1" longer than the 9' stand.
I think for just Speedlite(s) in a modifier, the 1052 stands would work well, IMO. If you want to use a boom, the 1004 or 1005 are better. I have the Manfrotto 024 boom that I've been using with a 600EX in a Lastolite 12x48" Hot Rod Stripbox as a hair/background light - a boom is great for that, as you can get the light over the subject without the light stand being in the shot.
Side note - the Manfrotto LBAG is great. The 90 would hold a set of 1052s, I have the 110 and it holds two 1004s, two 1052s, the 024 boom (without the counterweight), and a couple of Justin clamps.