I'm still on a lookout for a nice condensed font. Only DejaVu works, barely.
I've tried Myriad Pro Semicond and Cond, Din Text Condensed, Helen Condensed. The problem with all those, as I wrote previously, is they're a too small on 9pt and too large on 11 pt.
Garamond Premier, Warnock, Maiola and all those work ok, but I find the serif fonts harder to read on the low-res Kindle screen. Also, they're just too wide for my preference.
adamselene is right - there are just too many fonts out there. If anyone stumbles upon a nice and readable condensed, please post it here. Thanks.