core 2 duo P or T

I little bit confused when i want to buy a new notebook for my sister. i know the other specification that suit to her personality. but the one that make me confuse is the processor, which one should i choose an intel core2 duo P series or T series. So, i grab some of people opinion in both processor. here are the opinion:

1. The T-series have a 677-800mhz FSB, while the P-series have a 1066-mhz FSB. The T-series is older technology than the P-series. The P-series is also 45-nanometer technology, as opposed to the 65-nanometer technology on the T-series. Because of this the P-series uses 10 less watts, 35 vs. 25. The L2 Cache of the T-series ranges from 1mb-6mb, while the range of the P-series is 3mb-6mb. The difference in performance between a similarly clocked T processor and a P processor will be small, unless there is a large difference in FSB (Like 677 vs. 1066) or L2 Cache (like 1mb vs. 3 mb.), in which case the performance level will be noticeably different. If you have similarly priced choices with similar clock rates, you should go with the P series (from answer.yahoo.com).

2.The performance is the main difference among the T and P series. The P series are more energy efficent, have a faster (1,066 MHz) FSB, and are mostly part of the Centrino 2 line. The T series use 10 watts more of power and have a slower (667-800 MHz) FSB. Also, when the two series have the same clock speed, the T series will normally be cheaper by about $100 or so (from answer.yahoo.com).

3.this one i get from official site of intel

The processor number is one of several factors, along with processor brand, specific system configurations and system-level benchmarks, to be considered when choosing the right processor for your computing needs.

Intel processor numbers are based on a variety of features that may include the processor's underlying architecture, cache, Front Side Bus, clock speed, power and other Intel technologies¹. A processor number represents a broad set of features that can influence overall computing experience but is not a measurement of performance.

A higher number within a processor class or family generally indicates more features, but it may be more of one and less of another. Once you decide on a specific processor brand and type, compare processor numbers to verify the processor includes the features you are looking for.

A higher number within a processor class or family generally indicates more features, including: cache, clock speed, Front Side Bus, Intel® QuickPath Interconnect, new instructions, or other Intel technolgies¹. A higher processor number may also have more of one feature and less of another.

Processor numbers for the Intel® Core™2 processor family brands are categorized with an alpha prefix followed by a four digit numerical sequence. The table below explains the alpha prefixes used for the Intel Core 2 processor families.
hope this help you all. thank you