What is a good 7 inch approx monitor/lcd screen to plug into XL1s when shooting?

Check out B&H Photo they have many monitors for your camera. I use a varizoom and it's a good monitor for the price. Depending on what you want to spend on gear and your use for it, their are many options out on the market.

If you search the web find varizoom's site they do have demo models and open box specials that you can pick up for a decent price.

Hope this helps

Thanks that's great, I'm looking at the VZ 7".

If you're in UK try here:

http://www.lcd4video.com/lcd_monitor.html