If I could redo my first grow, this is what I would personally buy:
Tent height matters - having that extra couple inches to crank up the lights at the end of a successful grow just saves you headache. A square footprint is also just easier to work with illuminating.
Buy once, cry once with the AC Infinity fans. They're absolutely worth it, and the bigger the better because you can run them at lower speed to keep your grow quiet! Plus, a 6" kit can be used if you decide you want a huge tent later, or if you need a fan for exhausting your attic or a basement - they're the real deal.
Spider Farmer Bar Lights - I bought a G8600 out of my own pocket, and it's the best thing I own. Spider Farmer sent me a freebie SF-1000 board I'm trying out, and while I like it, the bar-style lights are substantially more powerful beasts.
If you have the budget for an SE-5000, that would be my dream light for a 3x3x6 grow, you won't need the full wattage, but the fact it covers the tent from edge-to-edge in lights means in terms of maxing your yield within a small space, it's hard to beat. If you're only going to grow autoflowers, or use the tent for vegging exclusively, a G3000 would be more than enough, an SE-5000 is serious overkill.
Here's the major pieces of my setup. Seeds by Northatlanticseed.com using mephisto and Dutch passion genetics.
400w light $199
Sonlipo 2022 New SPF4000 LED Grow Light 400W 5x5ft Coverage, Use 1323pcs Samsung Diodes Sunlike Full Spectrum Veg Bloom Switch Growing Lamps for Indoor Plants Seeding Flower Led Plant Light Fixture https://a.co/d/01YY4dU
60"x60"x80" Grow Tent $97
MELONFARM Grow Tent 60''x60''x80'' Reflective 600D Mylar Hydroponic with Observation Window, Floor Tray and Tool Bag for Indoor Plant Growing https://a.co/d/1Ytkr2U
RDWC Drip top $230
RDWC Top Feed Drip Hydroponics Systems, Recirculating Deep Water Culture Hydroponic Bucket System, 5 Gallon Hydroponics Growing System Kit with Water Pump, Air Pump(4 Bucket + Reservoir + Drip Kit) https://a.co/d/5CnVdsj
6" fan x 2 $50
AC Infinity CLOUDRAY S6, Grow... https://www.amazon.com/dp/B0B179135B?ref=ppx_pop_mob_ap_share
Smart Controller $99
AC Infinity Controller 69 PRO,... https://www.amazon.com/dp/B0BNLWT292?ref=ppx_pop_mob_ap_share
Ventilation fan kit $130
AC Infinity Air Filtration Kit 4”, CLOUDLINE LITE Inline Fan and Carbon Filter Combo, Cooling and Ventilation System for Grow Tents, Hydroponics, Indoor Gardening https://a.co/d/3VCvA07
PH kit $18
General Hydroponics pH Control... https://www.amazon.com/dp/B000BNKWZY?ref=ppx_pop_mob_ap_share
Nutrient Kit $37
General Hydroponics Flora Series:... https://www.amazon.com/dp/B09M942WYB?ref=ppx_pop_mob_ap_share
Hydroguard $32
Botanicare Hydroguard Bacillus... https://www.amazon.com/dp/B00IGFH25M?ref=ppx_pop_mob_ap_share
Update:
Returned light *only* because i was able to upgrade to the 600w version for an extra $90.
8w air pump gets replaced with a 32w tomorrow. Upgraded air stones to large 4" diameter for each bucket.
Smart humidifier will also be added tomorrow. Having difficulty keeping humidity up with Temps under 80°f. https://a.co/d/d4qjcTB