i perfer the 5 year warrenty that comes with the nice box...

Rule of thumb:
140-1.4Ghz
142-1.6Ghz
144-1.8Ghz
146-2.0Ghz
148-2.2Ghz
150-2.4Ghz
152-2.6Ghz
154-2.8Ghz
165-1.8Ghz but 2 cores
170-2.0Ghz but 2 cores
175-2.2Ghz but 2 cores
180-2.4Ghz but 2 cores

any questions?