So there are two trains of thought on the matter. One side says not to use HM oil until there's a problem, the other side says using it in advance will help prevent a problem from occurring. Pick which side you're on and make your purchase accordingly.
As for viscosity, go with the 5w-30 your manual calls for. Any name brand conventional, semi-synthetic, or synthetic will work for you. By "name brand" I don't mean only the big name brands, smaller brands such as Warren (Super Tech), Trop Artic, 76 Super, or auto store brand oils will do just fine. In fact, if you live in an area where you can find Trop Artic on sale for around $2 a quart, that's a very hard deal to pass up considering how good that oil seems to be.
If it were my vehicle, I'd be use 5w-30 MaxLife semi-synthetic. But I'm also a fan of MaxLife oil.