I’m new to the scene and haven’t played every last chance game on the list, but Popeye 7800 is an absolute must-own. It is simply the best port of the arcade game. The packaging is top notch as well.
Another vote for Baby PAC-Man from me as well. No other port exists, after all, and I personally love both Pac Man and pinball, so is an easy recommendation.
I’m surprised people aren’t recommending Zippy for the 2600. I find it to be genuinely fun, in addition to being a technical showpiece for the 2600.
I ordered a few carts earlier, but based on everyone’s recommendations I think I’ll pick up a couple more in the next few days.