StimX has MUCH too long of a half-life to be used for pre-WO.
The current version of Amp sucks major balls. (The first bottle I had was hella better - I think there have been batch issues.)
When IBE's Matrix drops - I'd say that.
For now - with the success of the many logs here on AM (Yeahright, Chaps, Jayhawkk, BeoWulf to name a few) - I'd have to say Focus XT by SNS.
For pre-WO, you have to find something that gets you "up" for the WO only - some stims out on the market nowdays aren't conducive for that (Venom is another) based on most people's experiences it seems.