I wouldn't go out of your way to get a modded tubescreamer (Analogman or Keeley) if you're using it as a clean boost for a recto. You want the tubescreamer to cut lows, and push the mids, which is what all the stock ones basically do.
The mods by Analogman and Keeley make them better standalone overdrives....they have more lows and smoother mids. This is not what you're trying to achieve if using it as a boost to improve a rectifier IMO.
The Maxon OD808 is my favorite for the rectifier.
That said, if you can get the modded one for less or the same price as a Maxon OD808, I'd say go for it. It will still work very well.