Actually the picture of that dress you posted is AMAZING, where did you find it? It is a wedding dress though.
If you want a 'blood red' dress then the gothic stores is probably the place to go. I check gothic shops a lot so if I find something then I'll post it up here.
My prom dress was £160 but it was worth it. If I was ever to get married I'd pay anything for the right dress [I'm like that xD]
This is pretty nice:
Bet it costs a FORTUNE.