I assume that means you haven't tried the E-3 yet. Do that. You'll be surprised. Olympus has performed some magic trick on that one. Viewfinder size simply isn't an issue anymore, and having an 4:3 aspect ratio also makes so much better to "move" around in.
this must be about the tenth time Ive had to dig this list up about OVF's
Olympus E-500 .............0.43
Olympus 410/510
Panasonic L10.................0.44
Olympus E-330...............0.44
Panasonic DMC-L1 .........0.44
Canon 350D/400D ..........0.48
Nikon D50/D70 ..............0.48
Olympus E-300 ..............0.47
Olympus E-1...................0.48
Nikon D40/D40X .............0.51
Canon 300D ...................0.52
Sony A100 .....................0.52
Canon 20D/30D.............. 0.53
KM 5D ..........................0.53
Pentax K100D .................0.53
Canon 1D1 .....................0.55
Canon 40D .....................0.56
Sony A700 .....................0.57
Nikon D2X .......................0.57
KM 7D ............................0.57
Olympus E3 ....................0.575
Canon 1D mk III............... 0.58
Nikon D80 .......................0.59
Nikon D200 .....................0.60
Pentax K10D ...................0.60
Pentax *istD.................... 0.60
Pentax *istDs.................. 0.60
Nikon D300 .....................0.63
Canon 5D.........................0.68
Canon 1Ds...................... 0.70
Nikon D3..........................0.70
Canon 1Ds Mk III............. 0.76
just recently Ive added a 1.2x Pentax mag finder (modified) to the OVF on my E3, now its 0.69 which is bigger than 5D on the list. I must say, the success rate with MF is more near 100%, where before with an E300 it was closer to 20%. It also keeps the LCD away from the face keeping it cleaner.