Silver is tough paint to spray evenly - even tougher to match ("even tougher" I said... nearly impossible). You want someone with a good deal of experience spraying silver metallic and that's not generally cheap. We always had very good luck with our supplier (Sherman Williams Automotive) and Datsun colors - what they had was very close to factory. I think we shot three silver Z's. Datsun metallic base paint is fairly inexpensive (for paint) and fairly consistent in price. It's the clear and hardener that will have a great deal of price variation. Be forewarned that cheap clear usually means greater LABOR cost or settling for a poorer outcome. Each painter you talk to will have a preference for the clear they use and they will have a reason they do so. If you go against their preference don't be surprised by additional labor or cost to get the clear looking the way you want it to. And please don't argue with the guy - after he's sprayed the paint you told him to. (Here in Phoenix our cost of just the final materials (sealer, base coat, clearcoat) of the brands we prefer would be just over $1,000 (using a very good clear but by no means the most expensive) and not talking of labor, fillers, or primers. We got a pretty good discount - and a painters discount may or may not be passed on to you. Paint cost is the very cheapest part of the job.) If you want the silver "to pop", spray dark sealer under the base. If you use a lighter sealer the silver metallic will look "washed out" and will not have as much character, For the most part paint IS NOT opaque. Underlying colors will have a visual effect - subtle but definitely noticeable. I personally despise masking around weather strip and trim. It may look acceptable at first but will eventually present a myriad of issues. Early on, we did one at a customers request and immediately afterwards made it a policy to NEVER do it again. You think you may be saving on labor cost to mask rather than remove but in reality labor saving is minute and the result is poor. We had several Z's come to the shop years after a "masked trim and weather strip" spray looking needlessly shabby. Pull the windows and trim and get paint underneath all the gaskets, trim, and weather strip. My last piece of advice - if you can't afford what the experienced painter quotes you just don't do it - don't look for a cheap quote. And, with a Z, you CANNOT hold him to an initial ESTIMATE (unless he doubles up). There are WAY to many unseen things that may pop up. (I said "MAY pop up"... Sigh... I can't remember a single Z in our shop that didn't have surprises unknown to the owner AND to us!) Oh,, ya,, we shot that. VVV