I have found that less is more when it comes to lighting. I also feel that buying quality pays. LIghting gets incredibly expensive, but you really can do a lot if you know how to use it.
To be honest, I'm looking at reworking my location lighting to a certain extent. I may do the following:
Sell one of my Elinchrom Ranger RX AS Speed pacs with S Head, Sell my 2 - 430EXIIs and buy an Elinchrom Quadra Pac when the Lithium battery is available.
That gives me the portable options of:
1) Ranger RX AS Speed pac with two A Heads.
2) Quadra Pac with a head
2) 580EXII
Option 1) can do pretty much anything because of the power range.
Option 2) can still knock down full sun enough to make it usable in that sort of ambient environment, plus it's a hell of a lot lighter weight than option one.
Option 3) very usable in open shade into a 60" white reflective umbrella shooting at ISO200 at F8, modifier 6 ft away, plus it would be my run and gun light.
I really like the 27" Elinchrom SB with or without grid and a reflector.
There is lots of info on POTN. Personally, if I wasn't an Elinchrom guy, I would maybe, and that's a big maybe, look at an Einstein set up with battery pack.
Studio lights give you the advantage of stronger modeling lights. Portable lights like the Elinchrom, have limited modeling light capability.
In summery, buy less items, but buy quality. How much do you want to spend?
BTW, I don't go anywhere without a meter.