I'll second the recommendation to upgrade to the Genesis. I've been using a Weber Silver B for over 15 years. I've replaced a few internal parts over the years, but, by and large, the components have held up really, really well. And the firebox is is awesome shape. I know it's more money, but you will never, ever regret the purchase. You're gonna have this grill for a very, very long time if you look after it.

I would add a decent grill brush, an instant read thermometer, and a grill cover (assuming it will be exposed to the elements when not in use) to your list of "must haves". I would not spend crazy money on the brush, as you're likely to replace that annually or so. Put the extra dollars towards a good instant read thermometer. Last but not least, get a decent grill tool set - tongs and spatula in particular. Spring-loaded tongs are best, and long handles are almost a must. You don't have to buy a "matched set", but I have some Williams Sonoma tools that have held up perfectly over 10 years of use. For starters, I would go to a decent restaurant/chef's supply store and pick up the basics. They will have instant read thermometers, too. You might want to look at a decent cutting board/carving board there, too.