Float does not compromise your ability to pull up. All of the clipless pedals will be just fine in this regard. As I'm sure you've read in other threads, you need to be sure the sole of whatever shoe you pick is stiff enough to prevent hot spots. With a few exceptions clipless pedals are smaller than your old platforms so your foot will collapse across it unless the sole is stiff.

Titanium spindles - light weight, spiffy and very expensive. If you're willing to spend that kind of money, go for the best bearings.