Some micro ATX cases have thier own PSU's, so its a good thing you asked =)
Here is a list. Post your case link and we can check to see what size psu it can take. http://www.newegg.com/app/ViewProduct.asp?submit=property&DEPA=0
you cant go wrong with fortron or enermax
Edit: Geez you have the setup in your sig in a micro case?
he has the same MB as i do hehe. it is not an HP is it? cuz if it is then i'm guess it is a minitower then i know the atx regular one will work cuz i checked the size.
Yeah that case actually looks like it uses a regular ATX size psu. Even though i cant find anywhere to actually prove that. You should be able to tell by looking at it.
It may initially work but you should definately upgrade. If it doesnt give you problems from the start (random resetting) it will definately give you problems down the road. Also, sometimes when they die the results arent pretty and could cause more damage to not only the psu but everything it is touching.
yeah there is a empty space seems like a agp slot used to be with two screw holes. i think it'll be fine with 250 as long as u dont plan on adding any more devices that uses power plugs. if u are upgrading the psu just to be safe might as well go at least 450w
No, 450w would be ideal for your situation. Always think ahead, a quality one starts at around 45$ so 60-70$ for one that will last you many years is worth it rather than having to buy again soon. Go with antec enermax or fortron. My suggestion for quality/price.. http://www.newegg.com/app/ViewProductDesc.asp?description=17-103-908&depa=0
(if you go with antec make sure it is TRUPOWER)