Just a heads up, when buying blu-rays, mind upscales. Funimation does an AWFUL LOT of upscales from 480p to 1080p, so it's just DVD resolution bumped up and postprocessed; depending on the postprocessing, it could be worse than the DVD.
There are, of course, HD shows too, but do keep in mind that the actual resolution for those is generally still 720p and not actually 1080p. Some might be 540p, tho. This happens because drawing actual 1080p detail is both harder and more expensive (since they also need access to hardware which not all studios have), so even when buying BDs, you'll want to downscale back to 720p generally.