Cesare,
Sure, lots of other choices are available, and many of them far cheaper, but few SLRs look as nice as an F2 Titan. There's no logic in buying one today, especially at the typical asking price.
But they're sought after because they look cool and are rare -- and, importantly, because Nikon isn't in italic font.
http://www.mir.com.my/rb/photography/hardwares/classics/nikonf2/f2/variants/f2titan/index.htm
Joe
Ah, ok, sorry, when you said 'best manual SLR' I thought you were referring to the features, not the aesthetics ;-) I know where you are coming from, having fallen for a number of cameras just on their looks.