iForce Hemavol has been the leader of pre-formulated pump products for quite some time, and, IMHO, stands at the top of the heap (far superior to formulae like Nitrix and the rest of the niché that's made by the big brands).
One scoop offers 2.5g of citrulline malate, .5g agmatine sulfate, and 125mg of l-norvaline. Combine in the other extras (epimedium, or icariin, is a great one) and the ability to use two scoops to really get the best doses of ingredients at a cost effective price (without worrying about mixing four tubs' worth of ingredients or having a flavor-related issue with bulk powders as is sometimes the case) is more than worth it - there's always some killer deals around too. It's great when stacked with Compete - especially when the Compete can be had for free.