Ice-Vibes are the best ones, but I also have a pair of Waldhausen that I realy like!
I use IceVibes by Horsewear. I love how fast the ice packs freeze and that they are still moldable to my horses leg when i need them. They are easy to velcro on and the vibe part stimulates and massages the muscles. You can even just buy the ice pack which is a much cheeper option.
I have the Finns Tack ice boots, they are cheap and hold up very well!