Charlie
I have a set of cactus triggers that I use for my non Canon flashes, although I have used them on my 430. They do work, but watch the shutter speeds that you use as I have found that you can get bad syncs at faster shutter speeds of1/100th sec at times. The clamps are a bit pants with a flash gun of the 430's weight ( not particularly heavy) so I used an external hot shoe and sync lead.
Now these triggers just fire the flash so there is no feed back to the camera. So it can be a bit fiddly getting the exposure correct, and does involve adjusting the flash manually, if you don't have a flash meter. If you only want the flash off the camera by a metre or so look at one dedicated flash leads that give full ETTL compatibility. They vary in price and you do get what you pay for. Having said that the cheaper ones do work but lack the "weather sealing" of the Canon one.
After that life gets expensive. The ST-E2 is about £160 and then you start heading into Pocket Wizard territory