Ok, first of all, don't go insane
You don't have to decide which one you want unless you do nothing now with the I-130 and wait around for the K-3 NOA2. Thus, you've decided to pursue to the K-3. Otherwise, send in that money and start the NVC process. It's usually 90 days without RFE's before it heads to the consulate.
Just because you are pursuing the I-130 does not mean you are abandoning the K-3. Although some have noted here that an approved I-130 invalidates the K-3, the K-3 may be approved and continue to be processed, nonetheless.
FYI, sometimes both the K-3 and I-130 make it to the consulate at the same time. At that time you can decide to inform the consulate you want to interview for one or the other. Now is not that time.