Can I get away with a 150watt PSU for this build?

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This case

http://www.avsforum.com/avs-vb/showthread.php?p=19786405#post19786405

comes with only a 150 watt psu that's some proprietary form factor so I can't replace it.

If I put in an i3 (lowest wattage decent intel processor) + a HD7750 (best video card that comes in 1 slot low profile form factor) is it going to be enough? The only other things drawing power will be 8 GB of ram, a slim DVD drive and a 2.5" HDD which draw maybe 10 watts combined.
 

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i3 draws 75 watts max running Intel HD Graphics, but will draw 50 watts max with a dedicated graphics card since the integrated graphics won't be running.

7750 draws 75 watts max.

So that's 50+75+10 = ~135 watts at most.
 

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Where do you think I should cut wattage from? Worse processor or worse GPU?