This is kinda a stretch for this discussion area, but figured I'd ask.
Various reviews have the Fridgidaire 15100 window unit as a solid buy. 900 sq ft of cooling, 399 at Lowes, 2/5 years of full/sealed warranty.
But I ran across another brand -- Soleus that has a few, but mostly positive reviews.
I'm getting this for by 24 x 24 shop. It's insulated. I tried a 12K btu unit, but it just did not have enough cooling power.