Interested in a glock 30s and a Springfield xds. Either way I love the silver slide. Glock told me they don't custom finish from factory, I found a company called robar but they seem expensive. Anyone know any other places that will refinish the glock slide to silver? Thanks for any info!

Robar is a nickel boron coating and more expensive. there are companies that do duracoat and ceracoat. I would recommend ceracoat for it's much tougher finish but it will cost a little more than duracoat. However, they are both somewhat cheaper
than the Robar or nickel boron coating.

If you want a silver slide, the best option is hard chrome.
Depending on who does it, you can have a choice of final look ranging from the original satin gray, to a stainless steel look, to a bright mirror polish.  It all depends on how the metal is processed before the plating is done.

Hard chrome is a very hard finish, and is very rust resistant.  It's proof against any solvent you might find outside of some dangerous industrial application, and is proof against many acids.
It's actually harder than a Swiss file so it's one of the few gun finishes that's really a lifetime finish.
Because of it's "slick" finish, fouling doesn't stick to it like to plain steel, it's much easier to clean, and it requires less lubrication.
When a customer asks for a really durable finish, most custom gunsmiths recommend hard chrome.  It's still the best all-around gun finish.

Most of the platers offer special pricing for parts like slides.  
Here's the top platers.  Read their info closely.  prices will vary depending on what you want.
Note that some use brand names, but it's all hard chrome.

http://www.apwcogan.com/

http://www.fordsguns.com/

http://www.armoloyftworth.com/Armoloy_WebDevelopment/Web_Pages/Firearms_Applications.htm

http://www.originalmetaloy.com/

http://www.techplate.com/firearms_pl.htm

http://www.mahovskysmetalife.com/

Check out the good folks at:

CCR Refinishing

http://www.springerprecision.com/ionbond.php

Thanks for the feedback!