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What alligoat said. You hear the stories "Oh, 300m water resistance means you might be able to shower without flooding it". That's a load of crap in my opinion. I'm an ex-commercial diver with 1000 hours at stupid depths and the only watch I ever flooded was when a Rolex helium release valve failed. I've had all manner of reps (yes, the cheap Chinese knock-offs) in the ocean all over the world, I've dived with them, beat them to death, and none ever leaked. If you're buying a copy of a tried-and-true case design, then as long as the seals are right, you're pretty safe. The Seiko MOD watches will go deeper than you'll ever want to. We did a topic here years ago about making a pressure checker from a Nalgene water bottle. I've done that and tested my watches to 90psi air pressure, which equals 52 meters seawater depth, give or take a little. That's plenty freaking deep for almost all weekender divers. And yes you'll be able to shower with it.

The best Rolex clone 3135 movement is the VR3135 at this time. I picked one up recently for $155 shipped to CONUS. As automatico says, you may need to have it serviced at some point- there's a couple of guys that do it- Tickleshoes and Michael at Watch Service NY- you might do better looking for them at RWI. Mine is in a late model TC case- a 16610. I've been doing Seiko mods for the last 1-1/2 years- I really like the NH35/6 movements and there's a whole slew of mods that you can do to customize your Seiko watch. I've used Namoki and DLW Watch parts on mine as well as Dagaz. The world of Seiko mods is mind boggling. I particularly like taking a $200 Seiko watch and ending up with a Rolex homage for $500 or less. You might check out Seiko Mods Dubai on Instagram- he does some cool watches. There's a whole list of modders doing these Seiko mods- check it out at DLW Watches or Namoki. There's really no need to worry about 300m WR- you'll never go more than 100-125 ft as a recreational diver. You might want to read up on saturation diving and learn about heliox, trimix and nitrox. Also, check out nitrogen narcosis- that's what happens when you go too deep with the wrong air mix. Also, you'll need some good equipment to test for 200m WR. My friend has a Bergeon tester and he only tests to about 3 atm even though it's rated for 6 atm- apparently it's risky pushing a tester to it's limit. You'd need some specialized and expensive equipment to test for 300m WR, but if you have deep pockets, go for it.