Thanks for the responses. These are the things I wish to get done on the 26 OTG:
1. Order some cast iron grates from Craycort. They have a sale through the 23rd. Stainless Steel is great, but I'm a sucker for those grill marks.
2. Order the Maverick ET-732 thermometer and install grommet holes. I've been using an oven thermometer right on the grate and sticking a candy thermomter throught the top vent of 22 OTS. It gets the job done for the most part but looks sort of ghetto. Litte apprehensive about drilling holes into a new Weber but from previous posts should be worth it.
3. Order Smokenator 2600. I was debating on getting WSM 18.5in. But with the added real estate of the 26, I think theres plenty of room for smoking a lot of items. I've been banking my coals to either side previously to smoke with charcoal baskets. Smokenator seems more neat/organized and better on feul efficency.
These accesories may not be necessary and I'd rather spend the money on quality meat/seasoning, but seeing that I plan on doing a lot of grilling and smoking on the 26, I can rationalize it in my mind!