There really aren't any more good 3.7" phones out in the marktet. If you want to stick with the DROID line, the 3 and 4 are only .3" bigger for a 4" screen. Coming from the Droid 1, this really wasn't a big change for me.
If you REALLY wanna stick with the 3.7" screen size, the HTC G2 for T-Mobile and HTC Rhyme for Verizon are ok. The G2 is about 1 and a half years old, but it's a pretty good phone. It'll never see ICS probably, but it's a decent daily driver. The Rhyme is HTC's more modern one, but it's a bit more entry level. Again, if you don't need high-performance these phones may work for you.