All of the regs you linked to are all intended for use with home brewing. They all will effectively regulate the tank pressure to whatever you want it at. You will need a paintball adapter as those regs all come with a cga-320 connection. (full size co2 cylinder)
None of them come with a needle valve. The part of your reg (which isn't a regulator, it's an on/off valve) you don't like is your Watts needle valve. It's not intended for a very low flow situation like putting one bubble per second into your fish tank. You will still likely be unimpressed with it's performance when hooked up to a real regulator.
You are better off going with something like a gla paintball reg or the new aquatek paintball unit. You also have the option of piecing a unit together yourself or buying one of the cheaper hobby regs like the Milwaukee or one of the aquateks for full size cylinders and getting a paintball adapter.
Hope this helps..
What would Honey Badger do?