R.E.
I agree any silver is not the choice for wedding bands, unless it’s
your 4th wedding and they plan on a few more 
Platinum is very nice, almost a guaranteed satin finish soon, but it
takes different techniques and tools than silver and gold. Stainless
is not expensive, the colour can be an acquired taste and a lathe is
really handy for bands. Titanium is not impossible to work, again a
lathe handy, but no solder. It is also very light for some peoples
perception of a wedding band.
I like white golds, lots of different shades and it is possible to
avoid Ni alloys. Last time I looked there was a price difference per
gram between 14K and 18K sort of proportional to gold content. You
are not buying Ni at gold prices. Harder to work than silvers but
easier than stainless or titanium. Nice stuff, just NEVER rhodium
plate. I like the metal. Recess the matte or textured areas for
protection and it is good for a long time.
jeffD
Demand Designs
Analog/Digital Modelling & Goldsmithing
http://www.gmavt.net/~jdemand