got to be either Liquidverb or Timeworks Reverb 4080L for me. The Liquid effects bundle is just delicious, the verb being the standout. Give's a lovely creamy reverb, i absolutely love recording my spanish guitar through it for other projects i do with mates, its just beautiful. The Timeworks verb is alot sturdier if that makes sense, feels more solid and gives a denser feel and atmosphere, sounds lush on pad's and synths especially