Im a bit dull about AC technologies but understand that wall sleeves require wall ACs. The current sleeve is
27 x 16.5 x 17 deep.
My understanding is that i can get any wall unit as long as it fits and if there's space i need a frame to fill in the gaps.

I was recommended the Friedrich Wallmasters https://www.amazon.com/12000-BTU-Master-Conditioner-115-volt/dp/B00SMMZBKC/ref=sr_1_2?ie=UTF8&qid=1482365340&sr=8-2&keywords=friedrich+air+conditioner+wall+115
but they are pretty expensive. I dont need any special features other than a remote control (temp sensor on remote is nice). I was looking Frigidaire's FFTA1033Q1
https://www.amazon.com/Frigidaire-FFTA1033Q1-Through-Conditioner-Temperature/dp/B00IYQYUCG/ref=sr_1_6?ie=UTF8&qid=1482365788&sr=8-6&keywords=frigidaire+air+conditioner+wall+115

Questions:
1. Can i use any wall unit
2. What models do you folks have good experience with?