You could try an app like Bytafont. It will let you change fonts system-wide or just in specific apps (I can't remember if Safari is one of them). Then go to http://www.iphoneruler.net and you can preview the fonts they have and find one that's bigger than the standard one. Once you've found one, search Cydia for that font (and make sure it's for Bytafont) and install it. Enable the font in Bytafont and you're ready to go.
Been using perfect browser a little more and it is very good. I was getting lag when setting it to the "chrome" style browser. When i returned it to "mobile safari" mode, it works as well as stick safari.
The nice hing about PB is that i can set the font size for any website and save it. So when i return to that site, it remembers the font i like!