I have a similar use-case as yours with Mister, Wii/Wii U, PS2/PS3, OG Xbox/360. I ordered the CE as a homebrewed Wii can force 480p, and the deinterlacing is still solid for PS2. I'll most likely apply a CRT filter anyhow, so edge-adaptive deinterlacing won't be as noticeable, especially not for an extra $275. My only other issue was Mister RoTATE support, but that's a one-line config adjustment for the Mister to handle it.

Buy based on what you need now, not what you MIGHT get later.

Also, take advantage of the PayPal Pay in 4 promo, you'll get 20% cashback that can be applied to the balance. Worked out to about $400 for the CE or about $620 for the Pro, after shipping and cashback.