Perlite is nice because it's really light, but that's also why it floats. Fired ceramic chips can take the place of perlite - they help with aeration and water retention, without floating. Sand is also an option, but very heavy; I wouldn't use a significant portion of sand for anything larger than a three-gallon pot. If you have a big pot, perlite will fill a big space without adding a ton of weight to the pot.
Peat and LFS are good starting places for most CPs, but they can get to rotting after a while if you don't regularly topwater and allow your pots to drain. You should be fine for the rest of the season, but once your plants go dormant this winter, you might consider repotting them into something like peat and perlite. You can keep the perlite from floating to the top of the mix by filling the bulk of the pot with your peat/perlite mixture, then top the last few inches with pure peat. If you like the look of LFS on top, use a final layer of LFS (a little peat in with the LFS helps it lie down flat in my experience.)
Watch out for marauding birds with that LFS, though - it seems that jays just love to make their nests out of it.
~Joe