Any head unit with a rear aux input will be suitable for later use to connect to a PC. Just make sure that you have the pre-amp outputs you need for the future. For a standard cab pickup truck, you'll want 2 sets of pre-amp outputs (1 for L/R 2-channel amp, 1 for sub).
Everything else is really up to your personal preference. A few head units such as Kenwood and Sony have a built-in aux input, but that Pioneer would probably work well for you once you get the adapter.