We're getting a little off topic, but it probably all goes to the OP making up his mind, (But jump in if you want us to move to another thread.
Rooz,
At the moment I have 2xSB800 @& 1x SB900. Also a couple of cables - SC-xx. I prefer to get the flash off camera, & that means I either use the PUP as master which is workable, but a pain. Unless I am photographing shiny things as the PUP shows up as a reflection even on "No Master Flash" - then it's unworkable unless I drop an IR filter in front of it. I also lose one channel of remotes. Or I use the SB900 as master at the end of one or both cables, daisy-chained. But that limits one flash to only a metre or so off camera. Usually OK, but not always. The SB900 is always master as the controls are just so good.
I keep looking at the R1C1 to get the SU800. That gets all my existing lights well off camera which opens up a world of new possibilities. It also adds a couple of SB200s which, as you have noted, would make great accent lights. I don't mind the funny batteries in the SU800 as they are good for 1200 or so uses & Lithium batteries have a GREAT shelf life. The same batteries in the SB200s are another issue entirely. Only 200 pops or so & I'll bet that's not full power pops. This will get expensive quickly. I also object to the environmental issues, both resource & disposal.
While my range requirements are generally not huge as I mostly use flash indoors, a bit more never goes astray - sometimes indoors means a large workshop - but I like the CLS system too much to go to Pocket Wizards & I don't need their insane range anyway. I also keep looking at the Radio Poppers, but it appears they are NEVER going to lose their vapour-ware status. In this country anyway.
I also do a little Macro photography & see that the R1xx system is perfect (well nearly !) for that. But it is not nor is it ever likely to be, the main focus of my photography.
I could forgo the SB200s & just get the SU-800, but then I lose their macro friendliness. That mushroom I referenced earlier would have been much easier if I didn't need about 12 hands to get it (the first shots - the later indoors ones were no problem)
This is the detail thinking behind my original post. If you see flaws or other ideas, let me know