I'm late to the party but since I love studio lighting chat, I'll add in my two cents worth and it's going to be random . . ..
I'm also late to the party, but I also love talking about lighting gear!
This is my first time buying a lighting kit and my budget is at 800$.
For first-time strobe set-ups, I always suggest starting with just a
single AC monolight, which you can always augment with any existing Speedlights you may already own [note: you can use your SB-800 by setting it to "SU-4" mode to enable its built-in optical trigger--firing an AC monolight remotely will also then trigger your SB-800]. Owning just one strobe at first, teaches you what you can do with only a single source before you move onto more complex set-ups. This also allows you to concentrate on mastering the applications of a single modifier (e.g., octa-type softbox).
I initially bought a Dynalite Uni400 AC/DC monolight as my first strobe, mainly for its long t.5 value (1/675th @ max power), which makes shooting above x-sync possible (i.e., so-called "HyperSync" applications). But, for your purposes, I would recommend Elinchrom's "budget" line of AC monolights. They have built-in RF triggers, and are directly compatible with Elinchrom's excellent line-up of Rotalux modifiers. In fact, other than the long t.5 value, had I to do it again, I probably would've gone with Elinchrom monolights exclusively. They're lightweight, affordable, and have very fast recycle times.
As I said, I already own a couple of Dynalites, but I've been thinking of replacing them with Elinchroms for portrait work. I've recently been doing a bunch of studio-lit headshots (interiors), and my 400Ws Dynalite Uni400 monolight is simply too powerful to enable shooting at larger apertures (numerically, smaller). Even at minimum power (1/8th), shooting through a double-baffled 3' octa, I'm all the way up to f/9 at ISO 50 at 1/250th.
So, for interiors, I'm planning to buy Elinchrom D-Lite 200Ws RX strobes which are only $339.99 each (the 400Ws version is only $355). With a five-stop range, it can dial down to 12Ws. My Dynalite can only go as low as 50Ws (the approximate equivalent of a Speedlight at full-power). Plus, since they come with built-in RF triggers, all you need to buy is a single Elinchrom Skyport transmitter ($112) for wireless strobe triggering. Also, this Elinchrom unit is one of the lightest (2.9 lbs.), fastest-recycling (just 0.8 sec. at full-power), 200 Watt-second monolights on the market. But most importantly, you'll be able to directly mount the excellent array of lightweight, Elinchrom Rotalux softboxes (but only up to the 53" octa) without wasting any money on purchasing expensive speedrings and adapters. Here's just a couple of possible ways to go, ranging from about $800 to about $1,000, with an AC inverter added in for the daylight package:
Single-source, interior set-up, example A:
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Elinchrom D-Lite 200Ws RX
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Elinchrom Midi Octa Rotalux
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Elinchrom Skyport Speed transmitter
Single-source, portable daylight-exterior set-up, example B:
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Elinchrom D-Lite 400Ws RX
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Elinchrom Mini Octa Rotalux
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Elinchrom Skyport Speed transmitter
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Vagabond Mini-Lithium AC inverter
Note that for on-location, daylight-exteriors, you'd need to buy the Vagabond Mini-Lithium inverter (or, have access to 120VAC), to power the strobe. Elinchrom also offers portable, battery-powered strobes (Ranger Quadras), but they're extremely expensive (if looking for a less expensive portable strobe system, B+H sells the
Impact LiteTrek 4.0 for $649.95). If going with one of the Elinchrom set-ups, you can also substitute an umbrella for any of the Rotalux softboxes to save a bit more money. My favorites are Westcott's soft-silver umbrellas, and the super-big, 7' Westcott parabolics (white, shoot-through, or silver), but most any other brand will do fine.