Guitar Amps And Di Boxes

Hello guys, i have a question:
I own a Behringer DI100 DI-Box and my idea was to connect the output of my guitar head (Marshall MA50H 50W) into the DI-Box so that i could get the tone of my amp into a passive mixer. This because I actually can't mic the speaker... Is it possible to be done without causing damages to the amp or the other gear?

So the connections would be:
Guitar->Amplifier->DI-Box->Mixer->Speakers

Thanks to everybody who will help me!

Advice On Guitar

Hello GMC!
I'd like to buy a new guitar for Christmas, I have atm a Yamaha TG121U running through a Boss ME-25 multieffect and a standard stereo integrated amplifier by Akai, and I'd like to upgrade the guitar with a Floyd Rose guitar...
Seems like my choices came down to 2:
1)Schecter Demon 6 FR Black Satin (Price 369 Euro, down from 429 Euro)
-OR-
2)Ibanez RG350DXZ White (Price 349 Euro, down from 409 Euro)

I play mostly metal (Heavy, Power, Prog, Neoclassic) and looking for a fast, comfortable guitar.
Fact is I wish a white guitar, and while the Ibanez is easily reperible in that colour, the Schecter seems really rare to be found in the vintage white model in my country...
I wanted to know your opinions, if would still be viable to get the white Ibanez or get the Schecter model though with another color.

Also wanted an opinion about a MARSHALL MA50H (Price 298 Euro, down from 469 Euro), if it is a good amplifier to buy togheter with those guitars for the genres I play.
I'm quite new about gear, and i wouldn't like to make mistakes.
Hope to hear from you soon,
Simone.