In terms of adding Wave Serpents and Falcons, I wouldn't advise it, assuming you want to use all the units which you already have. The reason being is that three into two doesn't go, which, more precisely, means that mixing infantry, Jetbikes, and transports, results in a mixed list which is usually heavily compromised in one or two of those areas. For a mixed list to function properly, you generally only have sufficient points to allocate to two of those areas, while maintaining internal balance.
You currently have a reasonable amount of infantry and Jetbikes, so it makes sense to develop both of these groups further, rather than adding Wave Serpents, Falcons, and Fire Prisms, in my view. If you want more fire support, therefore, I suggest that you look at Defender Guardians, Vypers, War Walkers and/or Wraithlords, and if you want more attacking options, you're looking at expanding your Jetbike wing, adding more fast attack units, such as Warp Spiders, or perhaps incorporating some outflanking options, such as the aforementioned War Walkers and/or Striking Scorpions.
I hope that helps.