What kind of "top quality" are you looking for? I like Verlinden figures most of the time, pretty good detail, straight forward clean up and construction but the figures are usually a little oversized IMO, more like 1/32 scale instead of 1/35
Warriors makes some good figures as far as I know, their poses are sometimes a little unnatural, but that might just be the box art, I have never put one together. Hornet is pretty much the place to go for heads, and if it doesn't have to be a full resin figure, Dragon figure kids are pretty well done, especally their Gen 2 figures, about as close to resin as you can get with plastic, I'd say either get a Dragon kit to save you money and replace the heads with something from Hornet, or go with Verlinden, as I don't have any first hand experience with Warriors and these are really the only brand I know much about.
Marines kits:
http://www.scalehobbyist.com/catagories/Scale_Figures/DML00006272/product.php?s=0&t=5&u=0&pg=1&ppp=24&sb=stocknumber&so=a&era=x,6&ct=1&sc=35
http://www.scalehobbyist.com/catagories/Scale_Figures/DML00006408/product.php?s=0&t=5&u=0&pg=1&ppp=24&sb=stocknumber&so=a&era=x,6&ct=1&sc=35
http://www.scalehobbyist.com/catagories/Scale_Figures/VER00002072/product.php?s=0&t=5&u=0&pg=1&ppp=24&sb=stocknumber&so=a&era=0,5,6&ct=4&sc=35
http://www.scalehobbyist.com/catagories/Scale_Figures/VER00001753/product.php?s=0&t=5&u=0&pg=1&ppp=24&sb=stocknumber&so=a&era=0,5,6&ct=4&sc=35
http://www.scalehobbyist.com/catagories/Scale_Figures/VER00001959/product.php?s=0&t=5&u=0&pg=6&ppp=24&sb=stocknumber&so=a&e=0&era=6&ct=1&sc=35
http://www.scalehobbyist.com/catagories/Scale_Figures/VER00001981/product.php?s=0&t=5&u=0&pg=6&ppp=24&sb=stocknumber&so=a&e=0&era=6&ct=1&sc=35
http://www.scalehobbyist.com/catagories/Scale_Figures/VER00001982/product.php?s=0&t=5&u=0&pg=6&ppp=24&sb=stocknumber&so=a&e=0&era=6&ct=1&sc=35
http://www.scalehobbyist.com/catagories/Scale_Figures/VER00001985/product.php?s=0&t=5&u=0&pg=6&ppp=24&sb=stocknumber&so=a&e=0&era=6&ct=1&sc=35
http://www.scalehobbyist.com/catagories/Scale_Figures/VER00001992/product.php?s=0&t=5&u=0&pg=7&ppp=24&sb=stocknumber&so=a&e=0&era=6&ct=1&sc=35
http://www.scalehobbyist.com/catagories/Scale_Figures/VER00002036/product.php?s=0&t=5&u=0&pg=7&ppp=24&sb=stocknumber&so=a&e=0&era=6&ct=1&sc=35
http://www.scalehobbyist.com/catagories/Scale_Figures/VER00002130/product.php?s=0&t=5&u=0&pg=7&ppp=24&sb=stocknumber&so=a&e=0&era=6&ct=1&sc=35
http://www.scalehobbyist.com/catagories/Scale_Figures/VER00002313/product.php?s=0&t=5&u=0&pg=7&ppp=24&sb=stocknumber&so=a&e=0&era=6&ct=1&sc=35
Japanese kits:
http://www.scalehobbyist.com/catagories/Scale_Figures/VER00000356/product.php?s=0&t=5&u=0&pg=1&ppp=24&sb=stocknumber&so=a&era=0,5,6&ct=4&sc=35
http://www.scalehobbyist.com/catagories/Scale_Figures/VER00001870/product.php?s=0&t=5&u=0&pg=1&ppp=24&sb=stocknumber&so=a&era=0,5,6&ct=4&sc=35
Not much available by the look of it for Japanese figures, what are you looking for these kits for? I think that you could probably get away with a scene with a handful of marines and some Japanese casualties or even no Japanese at all as they were mostly underground in tunnels and the like- just a tunnel entrance or a few bodys would be enough for a little scene. The only reason I use resin figures over plastic is back in the day before I started kit bashing figures, not a lot of plastic figures were offered in cool poses and scenes and didn't fit with the stories I wanted to tell, but once I started kitbashing Dragon/Taymiya figures, the figures can fit any story I make up and the plastic is much easier to mess around with/cut/resculpt and less expensive than the resin. Good luck hunting! And in the future you might want to change your post title to something like "Figures Needed- 1/35 scale Pacific Marines and Japanese" so people know what you are talking about without having to click into your post. Also I'm only assuming you want them in 1/35- if you wanted a bust or 1/16 scale full figures, I'm sorry but you didn't specify. Welcome to the forums Dan!