I have tried sparrow preamp out as lineout to ~$1000 speakers and $200 computer speakers, it sounds good, but compared to my dac19mk3 rca out, it doesn't have as much soundstage detail/depth or timbre variety and can feel compressed in complex passages, but it does have a powerful sound. Compared to compass, the sparrow is quite more detailed and accurate, but compass dac out has the advantage of being a little more natural and emotive.
If timbre variety, low volume ambient detail and distinct instruments are important to you, I'd say consider the dac19dsp. If you just want clear and fast macro-detail, good soundstage, some texture, and powerful drive, sparrow may be all you need. I personally wouldn't worry too much about the apple tv's jitter, from what I read people say it is a decent transport. There's things you could try to improve your transport, but it'll probably be trial and error. If you're worried about transport quality, and you happen to like timbre/ambient detail a lot, I'd say get the dac19dsp.