What is the honest definition of good in your case, and is your price inclusive of all parts or just the case + PCB + plate? As a beginner are you just looking for something to dip your toes in mechanical keyboards, or do you want to go full custom and build it yourself?
Within 75% there's a relatively huge range compared to years ago.
- Keychron K2 gets you everything minus programming at $70, for an entry level setup (plastic case, wireless/wired, white backlit, switches and keycaps included).
- KC84, RGB, wireless/wired, not fully programmable (has a lot though I believe). $90 USD.
- Entry custom with the XD84 on a bent steel case (PCB + stabs + Case is around $80 USD. Soldering required)
- KBD75v2 starts at $159, aluminum frame and foam included (no switches, no caps. soldering required)
- Upcoming GMMK Pro, $169 with RGB and hotswap, gasket plate. No switches or caps.
- Sky's the limit on the upper bounds, I believe there's a godspeed75 currently running at $380...
Switches and caps will level, or break your budget and are moderately of concern for compatibility. Right shift tends to be around 1.75u to accommodate the arrows, but there's a few options (or extra mod packs for keycap sets) to get around that. You can go from a cheap $20 Aliexpress PBT XDA/NP/whatever clone profile, to GMK/MT3/KAT profiles (typically around $100+) that easily cost more than the above boards. Switches can be as simple as Gaterons for next to nothing (under $30 for 110), or go crazy with NK Creams/Blueberries/Zeal switches (over $1 per switch, to about $90+ for a 75%. I'm aware there's pricier, I'm going with ease of accessibility)
I'm personally looking to rebuild a new work board (old Choc Mini, love that little thing still) and will be going with a KBD75v2 PCB, the XD84 bent steel case (minor compatibility problems), and Kailh Box Pinks. Caps are undecided but it may just get cheap Noppoo SA caps (~$30, requires a new shift key from other sets), or I might go nuts and pickup a dev/tty set. With the cap options in mind, that easily shifts my price point from ~$150 (PCB+case+everglide stabs+switches = $120) to $220 just with the second cheapest custom option above.
Would this define as a good board? For me it most likely will, but for someone who has a different taste in case aesthetics and a different desire for sound, that may be the worst option possible.