[quote=@TheMaster99]
Maybe Verdana? The 'I' (i) is distinct from the 'l' (L), which seems to be your main gripe.
[/quote]

I support Verdana. I'm not a big fan of serifed fonts on the web, and Verdana is a good compromise. 

Also check into the Google Webfonts, there's some good ones in there. [url=http://sachagreif.com/more-google-webfonts-that-dont-suck/]This author[/url] goes over some top fonts. Source Sans in particular has a straight uppercase I(i), with a small tail on the lowercase l(L) for differentiating the letters.