Honestly, weddings are high stakes so i totally get why you're stressed. The S5II is amazing but yeah, that tiny screen is hard for nailing focus when things are moving fast. The good news is the S5II has a full-size HDMI port, which is way more reliable than those tiny micro ones that break if you just look at them wrong. For your budget, i would suggest looking at these items to stay safe:

• Atomos Shinobi 5-inch 4K HDMI Monitor. This is basically the standard for simple monitoring. It doesnt record, which makes it very stable and less likely to overheat or glitch out on you mid-vows.
• Sony NP-F750 Lithium-Ion Battery Pack. Most monitors don't come with power. Be careful not to buy the massive F970 batteries for a wedding or your arm will fall off by the reception... the F750 is a good middle ground for weight.
• Atomos Coiled Full HDMI to Full HDMI Cable. Don't skimp here. A cheap cable will cut out right when the kiss happens and you'll panic. High speed is a must for 4K signals. A few things to be careful about: 1. Make sure to get a SmallRig Swivel and Tilt Monitor Mount so you can actually adjust the angle without fighting the camera.
• Turn on the Focus Peaking in your S5II settings. Itll show up on the monitor and make life way easier for critical focus.
• Double check your battery levels every hour. Monitors eat power way faster than the camera does. Youve got this, just try to test everything tonight so there are no surprises on the big day.

> I only have like 350 dollars left in my budget In my experience, you dont need to blow the whole budget. Ive used the Portkeys PT6 5.2 Inch 600nit 4K HDMI Touchscreen Monitor for tons of gigs and it works great with the S5II. Honestly, i once had a total panic before a wedding and this saved me because the exposure tools are so fast to use. Grab some Neewer NP-F970 6600mAh Li-ion Replacement Battery packs too and you'll stay under budget easily.

Saw this post while charging my batteries, honestly you're gonna love the S5II once you get the setup dialed in! I had a total nightmare shoot last year where the sun was just blasting the screen and I basically guessed the focus on the kiss... never again. Since you're on a budget, I'd skip the big names for now and look at something like the Feelworld LUT6 6 Inch 2600nits HDR 3D LUT Touch Screen. The 2600 nits brightness is the real deal, it makes outdoor ceremonies actually doable without those annoying sun hoods. It's super plug-and-play with the S5II full HDMI port too, no weird settings needed. Another fantastic option if you want something smaller is the Portkeys PT5 II 5 Inch 4K HDMI Touchscreen Monitor. I use this for my b-cam because the menu is so fast and it doesn't weigh the camera down. For resources, definitely head over to the CineD website or look up Gerald Undone on YouTube for his monitor comparisons, he is basically the king of technical testing for these things. Also, make sure you grab a solid mount like the SmallRig Field Monitor Mount with Cold Shoe 2905B because those cheap plastic tilt arms that come in the box always slip at the worst moment. You'll be well under that 350 limit with these and still have cash for extra NP-F batteries!