Some deep bass tracks:-

Goldie - Digital
Roni Size/Reprazent - Watching Windows
Massive Attack - Angel, Inertia Creeps etc.
Shut Up And Dance - Java Bass (Featuring The Ragga Twins)
The Prodigy - The Way It Is, You'll Be Under My Wheels, The Narcotic Suite: Skylined
Portishead - It Could Be Sweet

Many more, just going through a few on my laptop at work...