Well you have basically the best flashers mentioned by the other posters that are on the market currently. But using just one flasher may not be the best course of action though because there relatively small in shape. You should consider using 3 maybe 4 flashers for the rear PLUS some reflective tape and straps. You mount one flasher on the seat post and one each on the rear stays, this forms a triangle that can easily be seen by drivers and the triangle peaks their curiosity faster. Then as an option you could mount one on your helmet for added protection. Makes sure that whatever flasher you decide on that they can be seen easily from the sides; because remember, cars do come from the side and they also need to see you. Next take reflective tape and outline your helmet. Then take reflective straps and strap one on each ankle.

Maybe 2 Superflashers won't touch a single Dinotte, but the Dinotte has no side lighting capability, it's just very bright when viewed from the rear. The Cateye LD 1000 and 500 have extremily good side lighting, the Superflash is only so so from what I've heard from others on this forum.

I know buying 3 or 4 flashers could cost you close to $100 but considering your life is at stake just seems like a small investment to me. Also how much did you spend on your front light? I think that's it's amazing that people go out and pay $400 for a light or more, and have a single dim $20 flasher for the rear with little if any side lighting.