What size, and what models are you thinking of? What is your mounting depth? What kind of car? Remember, unless you can usually build the speakers out with custom made MDF or other spacers.
If they would fit, the MTX txc series would be your best bet for slim speakers... it's 4.8mm xmax is at the top of the heap as far as component speakers go. 2.25" mounting depth.
Second choice for overall sound quality would have to go to dei/directed... if I remember correctly, mounting depth is around 1.75" This set has a top-of the line crossover and fantastic reviews (previous models were the "Studio" series)
Third choice would be the CDT neos - nice glass cone with a tiny dust cap... should sound real nice.
Fourth choice would be the Focal slims (such as 165Vslim) - but fourth place is not bad... it's still in the top four.
The reason I put the CDT and focal last is because these companies seem to "dummy-down" their lower line speakers just to hit additional lower market price points... often, you are better off looking for another companies' top offering that is priced more fairly.