I am not in PI, but have some experience with Lasers. You need to do some research on marking some of this stuff. A reasonably priced Laser is quite restricted in what it can do.
What kind of metal? A 25W CO2 will mark anodized aluminum (maybe anodized titanium) but no other metals. Although, you can mark other metals using some marking fluids that you spray on, let dry and then Laser. The results are fairly permanent but the fluid is expensive and currently only in black.
You would need around 50W of CO2 for marking glass unless you use the above mentioned fluids. Cutting glass? Stone engraving? Good luck, bring that check book. I am not sure you can actually cut glass. I have never seen it done, but it may be possible with enough Watts.
Get on search engines and find out what is possible and what is not. I mean you can get Lasers, a Nd:Yag for instance that will do all you want but bring the check book.
Where manufactured? You get what you pay for. Low cost is not always economical. I favor the ULS machines. They have been around for 16+ years. I have 1 ULS and a friend has 5 of them and they churn out stuff 10 hours a day 6 days a week.
Dave