I just use the macks, soft moldable silicone putty ones. It's pretty much what everyone I know uses. If you lose a plug or they get nasty you can just pop in a new pair, no biggie. I tried a few different fancy plug types but they always felt like they didnt fit me quite right. The purple aqua block ones felt like they were trying to burrow into my brain- not a fan.
The putty ones might not work for you since you're probably not wearing a hood. I'm still looking for something that will stay put when I'm traveling and surfing warmer waters without a hood.
Someone mentioned these being good a while ago and I'm gonna give them a try at some point.
JBL Hydro Seal