if it doesn't aromatize I see no need for an AI, you are young, but I will spare you that as I wasn't far off your age either. I will also spare you the "you need test in every cycle" speech as you've probably heard it (though I agree wholeheartedly fyi).
I don't think that's too crazy a cycle, definitely use a SERM like clomid or nolva for pct though. I think you'd be happier running 500mg test for 10 weeks but alas I'm sure I won't be able to convince you, even if I tell you how ridiculous your sex drive will be and how awesome you'll feel, a 21 year old guy wouldn't care about that at all right
I don't know much about methadrol but for the most part non-methylated orals are not the strongest. Many may disagree but IMO if you're going to shut yourself down anyway make sure the gains are worth it. If you must run an oral I'd say superdmz/methadrol/dbol+AI would be better but that's up to you to decide.