Kerry, that's a very good shot, if you want something towards the front of the lens then I think you are looking at a ring-flash - but these can give a very flat light. If it was a Nikon I would recommend a Nikon R1C1 flash unit - If you click this link - LINK
http://www.kenrockwell.com/nikon/r1c1.htm
it will take you to a picture and explanation. I use one and Ken RocKwell Hasn't - it is a very good unit for what you want BUT I don't know if Canon have anything similar and the Nikon one is almost three times as expensive as the 430EX.