Your choice of gear is fantastic. Congrats. Nothing compares to Elite plasma.
Def Tech is awesome but with your budget that would push you into their entry line other than the smaller Mythos. I agree with 5Xwen, the Mythos look and sound killer, you can opt for the gloss black finish that matches Pio Elite stuff. The Mythos 1's are about $900 each though. You would have to go into the smaller ones.
Your room size, volume preferences, and speaker-type/size prefs, are really needed to make any specific speaker recommendations.
One tip... look at close-out speakers. Mid-level and high-end brands can be found heavily discounted because a new model is out, etc. I have purchased Mirage, Def Tech, Vienna Acoustics, and Energy for less than half price. Many other brands can be found discounted.
Example:
Just picked up a pair of Mirage Omni 550's for $399/pair for my friend. These were $1000/pair last year.
Link. You can get two 550s, two 350's or 150's, and a 150c center would be under $1k. Then get a Mirage (or SVS!) sub for $600-700 and you would be rocking and under budget.
That is not a recomendation for you, just an example. There are so many ways you could go. For really specific advise from those in the know, you really need to state your preferences and room size/shape/wife limitations.
Good luck and have FUN.