First question, Mom -- how much winter does Dalles/Ft. Worth get? You need a real winter to grow hostas. Forgive my ignorance of the Texas climate -- I've never been there!

One thing for sure: you will have to mulch your bed. Hostas come in all sizes...minis which will not grow more than 6"x12"...the other end of the spectrum are huge hostas that will mature 9 feet in diameter...example Titanic.
In hot climate, I would go for medium to large hostas if you have the space....unless you are ready to water very often small or minis hostas. As for which hostas go with which hosta, this is a matter of your personal choice. Lastly, I would ascertain that any hostas purchased will grow in your hot climate.

Good luck.

Papou

Welcome to the forum. Hostas will grow in Texas. A good place to start would be with some of the plantagineas like Fragrant Bouquet, Guacomole, Holy Mole, Stained Glass, Fried Green Tomatoes, Mistress Mabel, Royal Standard, Diana Remembered, or Tortilla Chip. Plain old plantaginea or August Lily does well here, too. I am also having good success with hostas that have montana genes such as montana aureomarginata--a real beauty, On stage--slow to come up. Others with montana genes are Alligator Shoes, Big Sam, Frosted Jade, Lakeside Cha Cha,and Mountain Snow. Krossa Regal and sports do well here also. Anything with white in the center will melt out and die here. Karin is one white edged one that has looked good for me all season. Night before Christmas and Whirlwind will make it here because they turn green as the season progresses. The blues don't stay blue for very long here, but they sure are pretty. I am finding that hostas with thicker leaves do better for me. It helps to get larger plants, but be aware that you will lose some no matter what. Hallsons and Northern Grown Perennials are good places to order. White Oak is also good, but they are finished for the season. Hostas do need lots of water, but they will grow in the shade and make a peaceful garden to enjoy. There was a discussion on the Texas forum about hostas.

Here is a link that might be useful: Hostas in Dallas discussion.

Thanks to you all for the great advice!
lisasmall...we have cold winters with some drops below freezing. Snow is scarce but ice isn't...
mary 52...I just saw a picture of the tortilla chip and love it! I'll have to look up some of the others you mentioned...can you buy hostas at any local nurseries or are they mainly mail order type plants? I'm on my way to check out your link. Thanks!