For ease of tuning it's best to stick with a brand that is known and supported with Ford specific data. Unlike aftermarket and some other OE engine management software, the Ford EEC requires the tuner to input ACTUAL performance data for the injectors you intend to use. Ford Racing, Deatchwerks, Lucas, and Siemens are the most commonly supported brands. Using other brands of injectors will complicate the tuning process.
I generally recommend Ford Racing 42lb greentops, Lucas 42lb, the new Ford Racing 47lb USCAR, 60lb Seimens, 80lb Seimens, or 95lb and up Deatchworks for E85 or big power. Using other brands or sizes will work, but there is little point. Save money somewhere else if you want to.
On the same note, fuel pumps should not be skimped on. The Walbro GSS340 should be considered the minimum upgrade - be aware of Chinese knock offs on Ebay! Buy only from trusted vendors!, and then the Aeromotive Stealth 340 for any application over 18psi boost.
And finally, there is NO practical reason to EVER install an adjustable fuel pressure regulator.
Skimping on these three things have cost a few people their motors and have cost MANY people for wasted tuning sessions at $500 a pop.