I too have a horrible time seeing an LCD screen out of doors. I also prefer to be ‘inside’ the image when composing, without the peripheral brightness and distractions found with looking at an LCD from a distance. This leaves me preferring a large optical viewfinder…
…But, here is my incredibly simple solution that I’m sure you’ve done with a jacket from time to time… just to throw it out there… try using a dark cloth over your head and camera (ala, Edward Weston).
This isn’t convenient for ‘run n gun’ and candid work, but if you are taking the time to set the camera on a tripod and are making multiple exposures of an HDR scene… than it’s probably a scene worth seeing well. (On a recent camera-testing trip… it would not have been uncommon to see me in the backcountry with black wool base layer (usually a sleeve) over my head and a camera (and tripod) at the other end. It’s a multi-use item!) Down sweaters, fleece, dark rain gear works too.
I agree with Mark that the size of the viewfinder in the G10 (and most compacts) is quite small and also with Rick that they are VERY inaccurate. They often border on useless.
If the size/price of the GF1 doesn’t work… than maybe it’s the LX3 & dark cloth combo (use only when precision framing is needed). Or it’s the compact G10/11 with its rough little finder… either way it’s a compromise.
I’d choose the one that you think would allow you to take the most photographs, given your shooting style. A smaller camera means it will fit in the pocket for quick and frequent access, but this is at the expense of a quality viewing system. Live view is a descent compromise, but it’s harder to see in sunlight and takes you out of the image. An SLR solves that, but it wont fit in the pocket… it’s a vicious circle.
I have also cut and tapped black trash bag to the back my 4x5 to use in place of a full dark cloth (the size/weight of a beach towel!). It’s lightweight, just leave yourself room to breathe!
‘Eye-balling’ the shot like Joseph suggests can be done with varying results. It is a common technique used by experienced rangefinder photographers who don’t wish to carry, purchase, or have the time for an external viewfinder with extreme focal lengths. Though, it’s much easier when the camera is ‘locked off’… unless you are also a Jedi. Joseph???