If you're a novice, I'd steer clear of the HTPC option. While great for the hobbyist, these are not consumer electronics products. The likelihood of an HTPC requiring technical support is still pretty high, and if you're unable to provide that support, then you'll find yourself in a bit of pickle. Regardless, I'd say a full-blown HTPC is overkill for your needs.
Like others, I'd say the Popcorn is a good option.