400w HPS&MH or 600w ?

Ok guys I need some experienced advice here. Iwill be buying a new light set up that I will have in a 3.5x3.5x 7ft Grow tent.The hood will be air vented and the tent will have good ventilation overall.Im sure a 600w will be fine in the winter since it will be in the basement.My concern is in the very hot summers we have here.I dont want to be battleing with HEAT issues, EVER.I plan on haveing 2-4 plants tops.What do you guys advice? This is the hood I will be buying.
HID EasyCool 6 Horizontal Reflector Grow Light - HPS - eBay (item 280195696885 end time Feb-01-08 19:12:58 PST)

No suggestions??? cmon guys......

sup dude, ....shit i forgot what your post was about........
oh right , yeah , that hood should be sweet , temps will be fine in summer if your venting hot air from bulb straight out . but i mean , youll still need decent circulation all around . The light wont be too hot since your sucking all the hot air out.

600 for sure, dont get the 400 cause you will wish you got the 600 trust me

I would go with the 600er for sure. Both lights get hot. Just have good venting and wazzam good to grow.

yup, i got a 400w , regretted it and bought a 600w......400w for sale anyone! lol