king you realy should have pre workout carbs. pre workout carbs are much more important than post workout carbs.
Its not a matter of energy its just more anabolic to have carbs pre workout.
pwo nutrition is WAY WAY overrated. Simply because repleneshing glycogen stores quickly has no positive impact on protein synthesis at all. The only thing important pwo is to get some carbs(doesnt need to be much carbs or high gi) and essential amino acids.
Read this thread to se the reason for pre workout carbs
http://forums.steroid.com/showthread.php?t=249518
This quote says it all
So if you want to limit carbs as much as you can, then a pro/carb meal pre workout is the single most important meal of the day.