Before you drop the Visa card on something else, do yourself a favor and visit here:
The PCB Einstein lights are selling their socks off, and the modifiers are amazingly priced. About a year ago I switched from a comprehensive Profoto kit to six Einsteins and PCB modifiers. No regrets at all. They're light, powerful, configurable and have passed my 12 month tough test...all my work is on location so the kit gets carted around all over the place multiple times per week. PCB support is legendary. The prices are low because you buy direct from the manufacturer, thus eliminating the middle-man. This is good American hardware.
I looked at them but the prices are a bit silly over hear in oz which made going with elinchroms a much more solid option.
still a good recomendation
I really like the look of the Paul C buff ring flash though it looks pretty awesome for the money if you buy it in the states that is
Another thing i would suggest is stay well away from the cheap monolights from ebay they are not consistant, cant change flash bulbs when they fail and not as reliable.
also i have tested my elinchroms will work up to 1/8000 second using my phottix odin triggers with the skyports they are still limited to xsync of the camera