Honestly, I think that you're good, then. If you want to buy more gear, don't let me stop you.

If you are concerned about the temperatures, you can always use a small fan around the receiver. Some people add computer muffin fans that will turn on with the receiver so that they are always running, or you could just get a desk fan or something to turn on low when you want to crank it up. Cooler electronics last longer, but most electronics need to get pretty hot before their reliability begins to degrade.