you probably went and picked something up by now, but in case you havent:
arginine increases your blood flow causing bigger pumps - yes, the benefit of this when you lift is that the more blood in your muscles, the bigger the pump, the more weight you can push = you'll grow faster. it is true that taking arginine a few times through out the day is to keep that pumped look and that is for cosmetic reasons, but arginine before a work out is benefitial. you can take a pill form arginine and stack it with a powdered nitric oxide product. Nitrix by BSN is really good, but expensive, so just find regular arginine pills try and look for ones with 1g per pill at least. and then stack them with any powdered pre-workout. pros and cons of some of them: superpump250 gives an awesome pump by far, but mental focus isnt quite as good as say NOXplode, which gives better mental focus but not as good of a pump - its got quite a bit of caffeine, but you might like that. xpand by dymatize tastes the best for sure, but it has 4.5 g of creatine in it so you have to watch how many scoops you take at once, so then again, you might not get as much mental focus. there are sooo many out there. honestly, go pick up superpump250 and give it a shot. i think you would like it. the bigger guys seems to like that one the best. and dont forget to stack extra arginine on top of it. arginine is your pre-curser to nitric oxide - you actually produce the nitric oxide, its not in the product. the raspberry lemonade is one of my favorite flavors in superpump