I understand what you're saying, I also am extremely meticulous about my cars. However, you really should let a professional replace your glass. These guys do nothing but replace glass, and they aren't big companies. They are small independent businesspeople that grow businesses on their reputation. I have had glass replaced in Lexus cars several times.
Thats fine, but I still would let the professionals install the glass.
Get a referral from the Lexus dealer. Dealerships don't replace glass. All these companies do nothing but replace glass on hundreds of cars, they know how to remove the panel on your Lexus and re-install it properly.
The company tests the color of the glass when they order it. Even if you order it yourself...you still have to select the color...
Like I said, Lexus dealers dont replace glass. Get a referral from a Lexus dealer, the place they send you to will have installed glass on hundreds of Lexus vehicles.
You will be surprised how little your comprehensive deductible saves you in your insurance. Going from a $500 to $100 deductible on my comprehensive cost me like $25 a year.
I don't discount that, but you have to realize that doing things like this yourself can open you up to voided warranties, etc...
Actually the windshield is not water repellant...only the side windows.
If you clay your new windshield well it should start to bead up.
But OEM glass is always the way to go...