Definitely go for a PS3. Even if it isn't the absolute best BD player out there its a damn fine choice and you wont notice any difference from the best standalone unless you have some seriously high-end audio/video equipment.
Plus lets not get into the additional things its capable of over a standalone (hello!!! its got a hard drive!, it can stream from PC to PS3 to PSP, plays xvid, music, oh and games!) Just don't forget to grab an hdmi cable and maybe the BD remote to make life easier