So... points crunching:
"downing" the EMLs to scatterlasers (which are better against infantry and transports than an EML is anyways), dropping two DA squads and the stones on the DA transpor (that's one of them) would give you, erm, 150 points, iirc. That gives you 150 points to field some Fire Dragons if you want 'em, and if this is a tourney list then you want them. Downing the Brightlances on the serpents that now belong to the FDs down to shuriken cannons gives you an extra 70 points to play with. At 220 points you can afford both DA squads, AND, say, take an extra falcon instead of the nightspinner to give 'drad a ride that isn't automatically one of the most important targets your opponent has. Or you could give the falcons chincannons. Or something.
The math for going Fire Prism happy is a bit less demanding, since you don't need Holo's for 'em. Having them cost 125 (you'll want to buy a chincannon for 'em, but that's about it) means that they're significantly cheaper than anything else you'd normally put into another heavy FOC slot.
That being said, I have a very polarized view of what a competitive list should be. Fire Dragons are your bread and butter, Dire Avenger are mainly objective holders, Eldrad is amazing (yay!), and extra upgrades for things is looked at suspiciously and forced to explain why it's necessary or else it's cut. If you don't want to make that radical of a change that's cool, and we'll still work with you on that. But you did say this is going to a tourney, so I replied accordingly.
edit: One more disclaimer on the rigidness of my point of view: The night spinner is, sadly, jank. The gun has been improved, sure. The model is a triumph, in my opinion. But... the rules. Yuck. It's not particularly worth 115 points in a mech environment BEFORE you consider the fact that it eats a heavy FOC slot. It's competing with Fire Prisms and Falcons. While it DOES do something that Prisms don't (ie, it doesn't have a hidden rule that says "take a pair if you're going to take any), but for 5 more points than a single naked one you could get 2 warwalkers in their sexiest configuration, have a transport killing unit with scouting and do about as much to hordes. If it was fast attack it might belong in bigger games. Since it's heavy, it's crap. Sorry GW, fail less. We have a practically empty fast attack slot. If you want us to get much use out of things then they need to not force you to avoid the strengths of the codex.
