IC diamond cooler is something that would help cool the laptop under stressful situations such as overclocking or prolonged use without shutting down, as u would have guessed, alot of laptops suffer from heating issues, well not sager, they are known for good cooling, having seperate fans for both GPU and CPU,
So in the end it is up to u, do u use the laptop for those kind of situations, also its just $40, out of 1500, so its not that bad,
Also, if i may make a suggestion when getting a laptop, get a RAID 0 SSD around 40gb to 128gb, put ur OS on it, trust me, the booting speed and general use speed is MUCH faster, also it takes very little battery life, has no moving parts so it wont get spoiled as easily , and u dont need to defrag it either!!
Anyway, the reason i linked those to companies since they have a vast range of laptop customizations along with different laptops, so u can browse and explore, find the right model and config u want