does having a too high wattage PSU matter?
Yes and No.
It matters in the sense that a higher watt PSU is going to create more heat in your system. Other than that, no other major concerns really. You can use a 600W psu in a tiny system. It will only use what it needs. It doesn't mean you are using 600w all the time, it means your PSU can put out up to 600w when needed.
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DonNagual covered the "No".
The "yes" is the quality of Psu. I'd rather have a stable 450w, (dual 12vlt rails)
than a no name/unknown 1000w Psu.
I used to have a 500w antec and now have dual 300w Psu's.
Mostly because I am using most of the combined 600w (mostly cooling)
but not rectifying 600w on one Psu creating more heat.
Bottomline: for Psu's, don't skimp, more is not always better.
Cool nick! :haha: