What is the best mechanical keyboard for any desktop model?

Building on the earlier suggestion, I might want to offer a word of caution regarding the Keychron V series. While it is a decent entry point, the plastic chassis can feel a bit hollow during marathon coding sessions tbh. Since you need reliability, the Leopold FC900R PD Mechanical Keyboard Cherry MX Brown is a much safer bet. Leopold is basically the gold standard for build quality in prebuilt boards. They use double-shot PBT keycaps which are way thicker than what you find on Razer boards, so they wont get that greasy shine after heavy use. Quick tip: make sure to verify the board has a detachable cable. It is a lifesaver if a wire gets frayed right before a deadline. I would stay away from Razer... the software is a headache. Just be careful with switch choices; if you want tactile without noise, Leopolds build makes standard Browns feel much more solid than the competition.

To add to the point above: in my experience, if you want something that strictly works out of the box without diving into the hobbyist rabbit hole, you can't go wrong with the Ducky One 3 Full Size Daybreak Cherry MX Brown. I've used many boards over the years and Ducky is consistently reliable for heavy workloads. It stays well under your 150 buck budget and the tactile feel is excellent for long coding sessions. If you want something even more minimalist, look at the Filco Majestouch 2 Full Size Cherry MX Brown. It doesnt have fancy lights or features, it just works for years. I've had one on my desk for ages and it never misses a beat. Practical tip: make sure you grab the Brown switches specifically, as they offer that tactile bump without the loud click of Blues. Ngl, those are the best bets if you need it to just work right away.

Unfortunately I've had durability issues with Razer lately. Just grab the Keychron V6 Full Size QMK Brown Switches because its super reliable for coding and wont let you down.

I hear what the others are saying about Keychron and Ducky, but I honestly disagree with going the hobbyist route when you are on such a tight deadline! I have been through dozens of setups over the years and you need something that is guaranteed to be reliable right now. You should grab the Logitech G513 Carbon Mechanical Gaming Keyboard GX Brown. It is absolutely fantastic for heavy typing and the aluminum construction makes it feel way more solid than those plastic frames mentioned earlier. Quick tip: those GX Brown switches are the absolute sweet spot for coding. You get that tactile bump but it wont drive you crazy with noise during a marathon session. I love it because it just works without any fuss. It is a total tank and usually ships super fast compared to the more niche brands. Just get it and get that project done!