i have buyers AND sellers regret almost every game. More sellers regret. But lately I've sold "better" games to get "lesser" ones (Sold BoP to get Sorcerer and Space Station) and been happy. Sold my AFM just before the remake was announced, so got top $$$ but miss the game at times. I'll never replace it because I paid a fraction of the replacement cost, but nice having that "A" list title in the group.
Just the same, I hesitate to sell my A and B list games any more because I don't want to devalue my collection. And, I admit it, it's cool having "A" list games.
So basically I've just been finding more space in the basement...
Back to your dilemma though - if you really like the game you're trading for, you'll be happy. That's the short answer.....