Hi
My first inline diffuser was an Intense model. It got clogged within 1 month 10 days. As you will be using the new diffuser for the moment, you can take your time to choose the extra pump or the type of setup you prefer.
I did a small test on the reactor. I noticed that when I lowered the water pressure to the reactor, co2 gas started to buildup quickly at the top and only the bottom blade blade was whisking the gas while the top blade was hardly doing anything. The moment I increased the flow, both blades were working at optimal speed and co2 gas was dissolved quickly with no build up at the top of the reactor.
If you plan to get a pump, I would suggest that you get one with more pumping capability but one that comes with a adjustable function. You can even try with a valve control if the pump comes with only one speed.
Cheers