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The other difference is a less sophisticated merge collector (cheaper to make).
From what I see, the streets are comparable to most of the other less expensive systems, like the Dynatechs for example. It really depends on what your ultimate goals are with your mods. Even with a H/C install down the road the streets would make good power. On the other hand, if you want the piece of mind of having one of the most efficient system available for the C5 the Pros are the way to go, you won't be leaving any power on the table.
Sounds like your going with the Fast LSX intake. That will prob req more tuning than Lou has in the $99.00.
If you're going with the Fast 90 I would consider going with a more efficient intake than the Blackwing.Vararam and Callaway Honker would be my choices.
Call Callaway at 860-434-9002 if you want to install a C5 Honker on a 90 mm throttle body-equipped engine. We have a special-size silicone coupler that lets you connect the larger t-body to the C5 MAF sensor.