I don't trust anything that has the name "BSA" on it. Although I have never used BSA's red dot scopes, I have personally seen their regular scopes fall apart. In fact, many people that I know have had problems with BSA's scopes. Again, I don't know anything about their red dot scopes, but if it's anything like their regular scopes, I wouldn't even think about it.
I agree with Jon - take a look at the Nikon red dot - you'll be happy. I have also heard good things about "Aimpoint" (if that's the correct name and/or spelling) although I haven't personally used one.
Zachary