If you’re primary use is watching blu-ray movies you can get something with many of the same features for 1/3 the price of a PS3. Sony, LG, and Samsung all make nice BD players and they’ll be around $100 this time of year. I got my LG this time last year for $125 and it streams netflix.
If you’re actually interested in PS3 games then it seems like a no brainer.
I wouldn’t worry about 3D capability. It flopped in the 50s and 80s and many experts are predicting it won’t fair any better this time either. What you can do is play on the stupidity of retailers and pick up the non-3d last gen, but still really nice, HDTVs for dirt cheap. Last weekend Walmart had a last-gen samsung 55″ 240hz for $1300. The only difference between it and the current model was 3D capability, and a $1200 higher price tag.