This is a good first attempt. There are some things though that you'll want to consider.
Fireblade: he's okay, especially if you're brining this many fire warriors. However, you might want to consider taking an ethereal and/or commander instead. The ethereal is cheaper and has some extra perks (
ld bubble) whereas the commander can really increase the effectiveness of some of your critical units through taking particular types of wargear.
Fire Warriors: I would cut them down to 10 man units and use the spare points elsewhere. You might also want to switch one or two into kroot units for sniping and outflanking for distant objective grabs. Taking carbines in a dfish is a tempting tactic, but you're losing at least a turn inside the vehicle and when you finally get within range you're going to be within the standard 18" assault threat bubble and away from supporting fire. Its a bit precarious.
Riptide: drop the drones.
Crisis: If you're going to take
BCs, I'd take two instead of taking one
TL BC. However, you already have a ton of S5 fire, so I would urge you to take 2x PR on each of these suits instead.
Piranhas: Take
FBs on all of them. You have a lot of S5 shots already. You could split them into multiple units and/or drop a couple.
Pathfinders: you don't have any. Markerlights are really useful, and you'll want to bring at least 8 (in two smaller units) in this list. I'd recommend finding points for them somwhere, probably dropping a dfish would be a good start.
I have a whole series of videos going over these types of things that you might find helpful.
http://www.youtube.com/playlist?list=PLcp01L5OCwjS3JlChSIg-QTa9fNv8Jl6n