Not sure if it is the 'best', and I don't think there is a 'best' mobile phone model cos certain model has this feature better than the others, but no model is better than all other rivals in terms of all features.

If you're thinking buying a high-end cell phone. I will recommend Nokia N95. It has 8GB built-in memory, built-in sat-nav, MP3 player, Wi-Fi, 5-megapixel camera, GPS, HSDPA and an innovative 2-way slide. It also boasts a luminous 2.8" QVGA display. The 2.6" screen displays 16 million colours, so watching videos, browsing the Internet or viewing maps is a real pleasure. With its expanded memory, the N95 8GB offers up to 20 hours of video or up to 6000 songs.