Laptop design and VGA cooler design are not the same and were probably designed by different teams of engineers. I'd look at professional reviews of various GTX 970 models for thermal testing results, but I can say that you should be happy with most GTX 970 models, there aren't any models that currently have cooling issues.
If cooling performance is a high priority, I'd look at the Gigabyte triple-fan Windforce models. There's nothing wrong with the twin fan models that Asus, EVGA, and MSI produce, though.
What country are you in? I don't know where you are so that may affect market pricing, but
geizhals.de lists the Samsung 850 Evo 500GB model at 182,50 €.
As for your processor, the i7 3770 should still be decent, is there a reason why that you feel it is inadequate? It may not be overclockable, but it is not a bottleneck for today's games, not by a long shot. Performance-wise, your i7 3770 is
only ~5% behind the current generation i7 4790K when compared at stock clock speed.
Your i7 3770 is nearly identical to the i7 3770K, so it is a valid comparison.
Unfortunately, your socket 1155 motherboard is of an older incompatible generation and will not accept the latest Intel processors. If you could find the overclockable i7 3770K then that would be nice as you can reuse your existing motherboard to save costs. That said, it's a bit foolish to pay money for nearly the same processor just for the overclocking feature, unless you were able to sell your i7 3770 to make up for the costs. On the other hand, replacing your existing motherboard and processor for the i7 4790K and Z97 motherboard would cost several hundred euros more for a ~5% improvement, unless you were also going to purchase a decent cooler and overclock it. It's hard to justify spending that much money on a minimal improvement.
