single or dual core

Hello, anyone can please help me on choosing a processor the dual core processor is a Intel Celeron Processor T1500 specs: 1.86 GHz, 512 K L2 Cache, 533 MHz FSB The single core processor is a intel core 2 solo specs: 1.4 GHz, 800MHz FSB, 3MB L2 Cache the reason i'm having a problem is because the core 2 solo has 3mb of L2 cache and faster frontside bus for responsiveness but the downside is a 1.4 GHz processor. Please tell which one I should buy.

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