cool list, looking pretty solid
>1. should I go MSU or 10 man, what about the noise marines
you probably want rhinos
>2. do I really want to buy 5 rhinos if I do everything msu
yes, putting guys in rhinos means two things have to shoot at one squad of space marines to kill it, sometimes possibly more due to the nature of dice
>3. how should I kit out my lords, termies and bikers? any good relics?
uh, I know the khorne axe was really good but since you're EC you can't get that
check traitor legions, I don't know slaanesh too well
for your terminators you should think about what you want them to do
the standard loadout is three terminators, each with a combi-weapon (combi-melta, combi-plasma, etc, note that the terminator champion pays more points for his combi-weapon upgrade because shitty codex)
this is because terminators are notoriously inefficient, however they become very efficient when you deepstrike them next to something you want to melta, then shoot with three melta shots, then your terminators get killed, but it doesn't matter because they already made their points back with efficient one-use-only melta shots.
They tend to be given power-axes so they can aggressively chop anything if they do manage to survive a turn.
Your bikers probably want some lovin' too, possibly plasmaguns, because bikers get relentless from their bike wargear, which means they can rapidfire the plasmaguns and then charge