Buildrswife,
I have had both I to it again, I would by double hung. I live in Wisconsin so the the extra storm windows that come with double hungs are really nice in the winter. Also, I have purchased a medium grade casements and the very high end. The medium grades are still junk as far as I'm concerned, there operators are sloppy. These are Weather Sheild and Hurd. I also now own Marvin arch'l windows and they are great but boy you pay for them. I think Pella are as good too. If you like the look of double hung then I would go with that.... my .02

We have a mix of casement and double hung.

The screen problem is the same for double hung and casement. The only difference is what you see inside. Marvin Casement offers screen with wood frame so our casement screen frame disappears into the window's wood. We used the same stain for all of them. During non-bug season, we simply remove all the screens, double-hung and casement to brighten the views.

Marvin also offers a "powered" handle for casement so that you can electrically control the windows that is difficult to reach.

We have hard-to-reach casement as well. We ended up using long reach mop and soft scrub to wash those hard-to-reach windows.

We picked casement over gliders because of the need to direct airflow. Casements are great for redirecting breezes into our house. We specified how each one opens in order to redirect cool breezes into our house in the summer. They have worked wonders in cooling our house and reducing A/C usage.

Thanks for the info! Philmont 2006, I am also in WI. Want to make sure we have good windows. I mentioned once that I liked the casements so that's what my husband had the company bid.....we'll still. There's still a little time before they have to be orderd.

Builderswife ~ we just had our house built (west coast of WA state) and EVERY window in our house (except for 2 awning-style windows in the pantry & mudroom) is a casement! Over the years, my husband and I have lived in houses from San Francisco, to Boston, to the UK and lived with every type of window. We chose casement for our new house because they are so functional and they add a certain kind of "character" to a home (our new house is cottagey). Plus, we chose a manufacturer that had a good, solid & energy conserving design -- 'Sierra Pacific'. They are wood interior and aluminum clad exterior. You asked about cleaning...our house is 2-story with gables, so no easy task to go up on ladders...but Sierra Pacific's windows crank open in such a way (90 degree angle) that the window opens away from the frame far enough that you can actually lean out and easily wash the outside of the window -- NO ladders needed! And like Calbay03 mentioned, we specified which way they opened to direct breezes, too.

I was unsure about whether or not I'd like screens on the inside either, but I totally LOVE them. We don't put them on every window either, just the ones we open all the time and most come down in the winter. The main thing I've noticed about them being inside is that they stay WAY cleaner...and I mean WAAAAY cleaner.

If you go with casements, don't scrimp, would be my advice. Get the very best quality you can afford. I'm smitten with them, as you can tell :>>>

Another option for casements is "invisible" screens. Both Pella and Andersen offer screens with a low visibility screen mesh that is hard to see from a few feet away. Andersen's is also available with a wood interior for the casements to further help them disappear into the window.
I prefer casements for their superior performance, wide open glass(no checkrail in the way), and better ventilation. But as sweetpea said, don't skimp. Get the best you can afford. That doesn't mean the most expensive, either. Compare options and features, and check warranties. Then decide what is the best unit.