I use the Pentax Digital spot - which gives me a 1 degree spot, and is very intuitive for shooting zone system. I also have a Minolta Autometer IVF with the 5degree spot attachement. Other than the spot size, the way that the minolta provides the exposure information I find much harder to use than with the Pentax.

I don't think that you will save $$$ with the Pentax, but it does work wonderfully.