600? 600 what? USD? None of those are that expensive dude!
Your options are all good but the question is" Can you use 'em to their true abilities?" If the answer is no, than cheaper mobos are enough.
If you don't wanna waste much money on a mobo, than Gigabyte GA-P35-DS3L will be your choice or ASUS P5EX38 for a little bit more expensive one but bundled with a 7.1 HD-Audio card.
------------------------------Intel Q6600 @ 3.0GHz + ASUS P5E X38 +
4GB DDR2 1000 CL5 Mushkin + Coolermaster Dominator Xcalade 690 + Corsair VX 450W + HIS HD 3850 512MB Turbo + Seagate 500GB 7200rpm 32MB + Zalman CNPS 9700 LED + Logitec EX110 + ASUS VW198S.
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