Looks as if it's time to purchase a new (to me) car because the repairs that the car needs are more than twice its value. I want to spend no more than $15K -- and less if possible. (I know, I know. I'm way too cheap.)

I will, of course, be poring over my latest Consumer Reports car buying guide but I'm also soliciting suggestions. My priorities:

1-5. Reliable: I'm serious. No garage bunnies need apply.

6. Fuel efficient: I'm currently averaging 30mpg and I do not want to lose ground.

7. Manual transmission: Better gas mileage, less expensive transmission repairs, more fun to drive. I only list this because I know there a few models that don't come in manual.

8. Reasonably peppy: I know, this is in contrast to #6 but I do have to get onto Houston freeways. My current ride is a 12 year old Mazda 626 and I've been very happy with its acceleration.

9. Addendum: If I go for a used vehicle (almost certain given that I don't want to spend much), is it worth it to pay a little more for a "certified" car or is that an expensive marketing ploy worth only the paper it's written on due to exceptions and other weasly words?

I would prefer a sedan type car but I'm open to other shapes that meet the above. Anyone love their car? Hate it? Any and all advice will be gratefully received.