pretty sure that Ed and Tracy know this as well or better than I do, but,,,,,you really can't do the whole list in either scale, yet
these sites will help you sort out a ship kit list,,,,,and you can see the gaps in models available
http://www.navsource.org/
http://www.hazegray.org/navhist/carriers/ is a list site of World carriers
http://www.quuxuum.org/rajens_list/rajen.html
the missing ships is what caused me to build only "one of each class"
no 1/700 or 1/350 Kennedy (NOT very similar at all to a Kittyhawk)
no Midways in 1/350, but, you can get angled Midways in resin, in 1/700, for a price
no Angled Essex, either,,,,in either scale,,,,and you need those for the 27C+125's, the 27A+125's,,,whether you want them for CVA, CVS, CVT, or LPH, you even have to get a resin set in 1/350 to do a 27C straight deck(of is that set for a 27A?, I forget)
you can get the LHA in 1/700 or 1/720, and the LHD's in 1/700 or 1/350, but no LHA in 1/350,,,,,,same with the LPH's,,,,,,in 1/700 okay, but not 1/350
CV/CVL-22 to 30 in 1/700 or 1/350, okay,,,,,,but neither has a CVL-48 or 49
the CVE that just came out will let you do the LPH Thetis Bay, if you are good enough to scratch the rear of the flight deck
there is a long way to go to get the "full list" in either scale,,,,but, it is getting better
hope the links helped
Rex