Chances are that doing the mods in the order you've chosen is going to put you in a position for premature or accelerated head gasket failure. The injectors aren't something that should really be considered a "modification", but rather a support system component. They will be required to support the additional airflow, and thus boost pressure created by your new blower.
I understand you needed a rebuild, so you opted to get the MPII package with rebuild. I don't blame you, because that was an efficient was of doing thing if you knew you were going to buy the MPII anyway. The raised top is a must, so make sure you add that to your order. The stock top is already a major bottleneck in the system, so adding an MPII blower behind it will just back it worse. The blower will end up running hotter, which will make your intake temps hotter, which will result in less power gains (unless you have a FMIC, that is).
I'm glad to see you've picked up a MAF and TB to support the blower upgrade. Those components are as important as the raised top in terms of allowing more volume to pass through the system with less restrictions. I see you've got the fuel pump to support your fuel pressure, so if you end up running the 30#ers, at least you have the pump to back them up.
On a last note about injectors, Jason Wild, a local SCCoO member, can get a set of 42# injectors (6) for a little over $300 Canadian. If you look on any US website, you'll notice that 42#ers generally cost in the $400 USD range, or more. You will have to send your MAF out to be recalibrated, but you could do that while you wait for the injectors to be mailed. I would also suggest you installing everything together, rather than in pieces. All the mods we've talked about will support the blower, and contribute to its capability to create more power to the motor. Do things once, and do it right.
PS. I did exhaust, engine, then mods. (no offense, Steve)