Honestly, I think the creatine and caffeine in NO Xplode are more important than arginine and the other "nitric oxide" ingredients. Quite a few bodybuilders consider NO completely worthless. I've heard it claimed that nitric oxide as a compound only has a half-life of a few seconds and if it could actually be sustained for any time, would draw blood from vital organs. I haven't taken the time to research it for myself, but personally I've gotten the same thing from creatine and stimulants seperately that I got from NO products containing creatine and caffeine.
If your goals are strength/explosiveness and muscular endurance, creatine and beta-alanine (or straight carnosine; beta-alanine converts to carnosine in your body) are the most proven supplements you can get. Aside from that, all you need is whey and either a good multivitamin or a diet rich in fruits/veggies to fill your nutrient needs. If you're looking for extra explosiveness during your workout, you may want caffeine ... In that case, you can use NO Xplode, whey, and otherwise rely on a good diet. It depends on your goals.
When it comes down to it, whey, creatine, and a decent multivitamin are probably the top 3 supplements you can get for performance or strength. Other than that, focus STRONGLY on your actual diet. If you're not getting consistent enough results and you have the extra money for other supplements, there are a few decent ones that will enhance your performance in the gym. Just remember that your diet is your #1 supplement.