Random things:
eBay bidding 101: Get a friend on another comp and only bid in the last 10 seconds. You will lose a lot less.
troupe leader is playing under 2nd edition, so some of the equipment he mentions isn't legal in 4th edition.
Scatter lasers will instant-kill you if you fail your armor save.
I wouldn't recommend a Wraithlord at smaller point values as it is too slow.
End Random Things.
As far as tactics go, I'd recommend that you try a balanced force with some Venoms, some footsloggers, and some DJs. You may think that this is stupid, as Harlequins should be min-maxed to the extreme. However, in my experience, Harlequins with a bit of redundancy suddenly become-super Harlequins. Therefore, I'd recommend going with a mixed force to start with.
Good luck!