XG1 Box Replacement

I would like to swap my XG1 for the most updated replacement box available. Can you look at the model XG1 I currently have and advise if you have a replacement box that is more updated? I want to be on the most updated box available because my current XG1 is sluggish. It has been slow from the first day I got it (I think it has a slow processor) but is worse now. Do you have a faster box available that has better performance for streaming apps relative to the very specific model I have now? I'd prefer not to travel to a store without confirming first that there is an updated box available.