questionswhat's the cheapest blu-ray player to meet my…

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Here's an article that may be useful for you:
http://reviews.cnet.com/2795-9991_7-386.html

The cheapest one i am seeing is Panasonic DMP-BD87 Ultra-Fast Booting Blu-ray Disc Player, about $80 new with free shipping or $50 + $7 shipping for a refurb.
http://www.amazon.com/gp/product/B00752R4S2/ref=olp_product_details?ie=UTF8&me=&seller=

You need to look at it to make sure it has RCA output-- the world is all HDMI now, which is causing me some trouble with some of the older equipment in my entertainment setup.

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I don't think a Blu-ray player is the best choice. You can try the Blu-ray dirve+Blu-ray player software.
For Mac, Aurora Blu-ray player
For Window, PowerDVD, total media player, macgo, etc.
BTW, i'm using the Samsung SE-506AB BD dirve

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Here is a well reviewed Sony blu-ray player. Also has your composite inputs for you until you upgrade. Great price for the specs IMO.

http://www.amazon.com/Sony-BDP-S390-Blu-ray-Player-Wi-Fi/dp/B006U1YVZ8/ref=sr_1_3?s=electronics&ie=UTF8&qid=1354211629&sr=1-3&keywords=blu+ray+player