Overheating Laptop. (Again.)

[Matt]

Hey,

So-I've had my HP Pavilion DV7-4150ea for a while now. It runs at 2.8GHz (turbo on the stock i5-460m processor (yes, G1 socket) at around 100'c on LFS (It's like that with every game and yes, I know, it's not healthy for a computer at that temperature-but it has run reliably for a few years). The laptop has an under-laptop cooling rack, with fans-meaning there is airflow and hot air extraction (which isn't very efficient) to the laptops main vents (which, for reasons I don't quite understand-are on the bottom...*slow applause to the dimwit who thought that would be a good idea*)

Now, the question is, with a budget of £50-would you suggest a full clean out and heatsink replacement
or
Spending that money on the i5-580m (the one that goes up to 3.33ghz) but running it at around 2.9GHz, with a new heatsink and thermal paste.

Please don't tell me, for I already know, HP Laptops have the single worst cooling systems known to man.