you will have a nice scaler which will beautifully upscale your standard definition (SD) tv network only if you have a digital setup box. I have such a setup box for only 3 1080i channells, the rest is in SD. But those SD sometimes fool you into thinking you are looking to HD signals.
SD movies ripped to computer and then to the internal media player is a feast
but i wonder why did you buy the 3800?
best would be the new 3100. you miss the internal media, but the player is not fault free, has its own glitches and behave like a spoiled child and is only good for SD material as it cannot handle HD or Blu ray material. Also at its "end of life" as a product .
The other thing of the pro is the reason why i have it: the SDI inputs
read too many stories how much better picture quality it gives compared to hdmi
So i wait until my Sony BP-s300 can be modified with an HD SDI output
But such a modification to the player will be 800 euro (1k+ $) but worth it
If you dont plan to use the sdi in the future then to buy the 3100 would be a wise choice even with an external media player of pixelmagic would be a better choice