|First off, my condolences on the loss of your mix tape. That is a pain that will linger, I'm sad to say. Here's to better days.|
As to recommendations, anything off Stereolab's 'Emperor Tomator Ketchup' is a fine addition to any mix (my personal fave is "Cybele's Reverie" but any choice is valid and wise). Fatboy Slim's "Praise You" or "Love Island" are sure to get butts wigglin'. And would it be a retro-90s mix without Nirvana? I think not. "Come As You Are", my friend.
Lastly, and not to argue with your choice of Breeders track, as "Cannonball" is indeed a top-notch ditty, but do consider the single version of "Saints". It features a pleasingly dirtier production aesthetic and growly, fuzzy vocals. Lovely lovely.
I can send you mp3s of any of these if you happen not to have them in your collection.