Honestly, the FX30 is a beast but it can be really overwhelming if you are not used to it. Unfortunately, a lot of those cheap vlogger mics you see online just arent reliable enough for a wedding environment. I had issues with a cheap 3.5mm setup cutting out mid-ceremony once because the cable got bumped and it was a total nightmare... honestly almost ruined the whole video. Since you have that top handle, you should definitely use those big XLR ports. They lock in place so you wont accidentally pull the cable out, which is a huge safety plus for a one-time event like this. If you want simple and reliable, I would look at the Sennheiser+MKE+600+Shotgun+Microphone&linkCode=osi&tag=5422-20" target="_blank" rel="nofollow sponsored">Sennheiser MKE 600 Shotgun Microphone. It is built like a tank and sounds way more professional than the internal ones. You will need a short cable like the Kopul Studio Elite 4000 Series XLR M to XLR F 1.5ft to connect it to that handle. It just works. The fuzzy thing is called a deadcat, and since you are in Seattle, you absolutely need it for the wind outdoors. It is kind of disappointing that Sony makes the learning curve so steep for people just starting out, but using that handle is actually the safest bet. Just plug it in, set the switch to Mic +48V and let the camera handle the levels on Auto if you are nervous. If you want something even more plug-and-play without cables at all, the Sony ECM-B1M Shotgun Microphone slides right into the top of the camera shoe, but it is a bit pricier. Stick with the XLR handle tho, it is much more secure for a wedding.

Unfortunately, I've seen too many people trust those on-camera shotguns for weddings only to realize later they captured more of the guests coughing than the actual 'I dos'. Its a total letdown when you get home and the audio is just thin and distant. I had a nightmare session years ago where a plane flew over during the vows and my shotgun mic didn't catch a single word over the engines... honestly felt like a failure. If you're nervous about the big XLR ports on that handle, you might want to look at the Sony ECM-M1 Compact Shotgun Microphone. It slides right into the shoe on top of the handle and uses the digital interface, so no cables or batteries are needed. Its basically dummy-proof. But for the ceremony itself, you really need a wireless kit on the groom. I usually point people toward the Rode Wireless PRO 2-Channel Recording System. It fits your budget and has this 32-bit float feature, which basically means you cant mess up the volume levels even if they shout or whisper. You just plug the receiver into the 3.5mm jack on the side of the FX30 and it works. Having a backup recording saved directly on the little clip-on mic has saved my skin more than once when the wireless signal got wonky.