Guess I missed the edit window.
Anyway, I've been looking at hlj.com for their 1/350 scale ship kits, and I've found quite a few really good additions for coastal gaming. In addition to the usual battleships and cruisers, there are corvettes and destroyer/destroyer escorts available in 1/350 scale.
Now for some highlights of 'Interesting models':
USS Gambier Bay, CVE-73. link
IJN Heian Maru, submarine depot ship. link
NYK Line Hikawa Maru, a passenger ship. link and later turned into a Hospital Ship link
a Polish torpedo boat (I think a former German one). link
This next kit is a really good deal, even if you just throw the E-boat away for being visibly the wrong size next to your Warlord E-boats: the Sailing Ship Christian Radich, a surfaced U-boat, and an E-boat! link
How about an IJN transport sub for your PT boats to chase down? link
There are all sorts of submarine kits to work with, from German to British to American to Russian to Japanese, and you can even get some of the Japanese sub-carriers (several different classes). You can also get Japanese submarines with Kaiten suicide torpedoes.