What strings should i get?

I play metal and right now i have yellow roto strings.
I like to play in drop d tuning and sometimes drop c.
So whats the best strings to use for drop d tuning metal?

Bc Rich Warlock

Fender Stratocaster

Marshall VS100R

Laney Linebacker

Digitech Death Metal Pedal
its all a matter of taste really, but i rekomend to sttart off with Ernie Ball skinny top heavy bottoms (gauge 10-52) if your keen on the drop D or C.
The heavier the strings the better.
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I have a question to: What strings would be best for Black Metal, I only play in E standard.
Sorry for hijacking...
for drop d, heavy bottom skinny top. for standard, 10-46 or 11-49