Depends what you want, 90% of the ebay triggers use the same circuit board as the pt-04's
I had a set of 3 PT-04s for a whole year shooting with them most days and i think once a receiver let me down.
Most of my stuff was shot outside too.
I sold all my gear but im buying again soon, this time il be buying these slaves for the 'brolly compatibility.
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=180475334890&ssPageName=STRK:MEWAX:IT
Light stands just get a couple of cheap tripods at least one thats capable of 6ft.
As jim says if your going wireless you dont need dedicated flashes, any old junk off ebay will work, just try and sort some thing with manual setting so you can vary the power.
I had 2 flashes that were 20 quid each new from ebay. they did me fine. I also had a vivitar 285 which i loved.
IF YOU DO BUY RANDOM OLD FLASHES OFF EBAY DONT PUT THEM ON YOUR HOT SHOE!
I used to use flashes for nearly every shot
example
perfect day but i still shot with 3 flashes.