8x10 isn't really ULF.
For landscapes, any modern Plasmat type lens from 240mm to 360/420mm would be a fair start. For portraits, the 360/420 will be better. There are many lenses out there, you will find it worth your while to learn a bit about them. You may want a classic lens to complement the alt. processes.

The best online rescource I know of for LF info and advice is http://www.largeformatphotography.info (homepage, lots of good basic introductory info here) and http://www.largeformatphotography.info/forum/index.php (question & answer fora).