The three multicarts I have are:
A Jay Smith 72 in 1 dated 2008 that came with the Vectrex when I bought it.
The VecMulti, which uses an SD card and is probably the best thing available since you can add new ROM files.
Jason Kopp's multicart, which is really good for having so many games embedded, and he only charges $20 + shipping for them. The ultimate bargain. It also has an LED on the cart, which is a nice feature.
The buzz off kit is better than I imagined it would be. It not only eliminated the headache-inducing buzz, but also the slightly pulsating graphics. I didn't realize how noticeable that was until it's gone. What a difference. It looks more like an arcade machine than ever now. I've gotten a lot of negative comments about having the buzz-off installed ("It's not a Vectrex without the buzz"), but I disagree wholeheartedly. HUGE improvement.
I will look for and try Vector Pilot and Vector Patrol as I haven't seen those. Thank you for the suggestions. My favorite is probably Armor Attack.