GSS340 with an In-Line Pump VS with a BAP?

I'm looking for advantages and/or disadvantages of running a Walbro GSS340 (high output 255 lph) in-tank pump combined with a Walbro GSL392 in-line pump compared to running just the in-tank pump but with a Kenne Bell Boost-A-Pump (BAP) on my supercharged '95 Cobra.

If you have any experience with either of these setups I'd love to hear what you have to say. What power levels have you achieved with either setup?

Thanks,
Ryan

Currently, probably right around 550-575 rwhp. In the future I don't know but if I do ever upgrade any further it would be 700+ rwhp. But I have no plans for that kind of power any time soon. I know I am right on the edge of what is feasible with stock lines/rails but I really don't want to spend $1500 on a "heavy duty" fuel system if I don't need to.

I'm usually not one to skimp but I feel like if I upgrade I'll do it all and then only use 10% of the potential of that system. But I know if I keep the stock style setup I'm probably running it at 90%+ of it's capability. If it can't be done, then I'll do what I have to do or suck it up and just keep boost low and only run 500 rwhp. I'm just trying to see what my options are, if any, to just upgrade pumps for now.

Thanks for any input,
Ryan