The flight time stallion. An affordable 7" Dual-Sport build intended for cruising, chase camera, and endurance racing. Target budget of $250 , and I couldn't help myself with some unneccessary bling that makes this really stand out.

This is a 130mph rocket, that can just as happily freestyle and cruise for upwards of 10 minutes. As a 6S 7" setup, this is an ideal endurance racer for long flowy tracks, and with a GoPro on carbon top plate, an excellent chase quad.

As far as setup details, I've settled on the Cicada 6S 30A 4-in1 ESC as the best value option - BLHeli_S works great for me, and this has been bulletproof with the addition of a 35V 1000uF FM Capacitor. After causing a couple of ESC fires trying to get really cheap motors and ESCs to work with 7042 props, I decided to move up to GWX2507 motors in 1500KV paired with a Cicada ESC. I'm planning a clone of this with the G2508 1550KV motors, but otherwise identical setup.
The Furibee F4 V5 works great even on 6S, and the simple MMCX AxII attached has really excellent RF performance. I haven't stretched its legs past half a mile, but this would be an excellent long range platform, especially with a 6S 2200mAh pack.

This is mostly missing a GoPro mounting capability, although that is currently a deliberate choice since I am looking to maximize flight time with a really light build (<550g AUW) that will allow me to run affordable 1300mAH batteries with good flight times, or casually move up to 6S 1300mAh packs to get up towards 10 minutes.

What is most amusing to me is calculating that I can have a 7" quad that weighs the exact same as the first 5" quads I've built , thanks in part to some high end parts, but mostly understanding what pieces I don't necessarily need to bring along.

UPDATES:
Moving to 6S 1300mAh packs, this thing screams on 7" props. Hilariously fast on the top end, still has piles of grip in turns. CMad took this one out for a spin on the BMPR-3 track and handily destroyed my fastest time of the day even on an unfamiliar quad. The top speed and punch with that much pack is absolutely savage. Everything handled 6S and high throttle insanity just fine, so I'd rate this as a full on 7"-6S rated build.

Banggood cannot figure out how to ship the correct motors, so I'm stuck with the WX2507 Deerhound version instead of the G2507 Madrid. Frustrating, but I can't think of a better excuse to try pinning it with a 5S pack.

It's not terribly fast outright on 4S - actually fastest with 6055 triblades (6x5.5x3) props with those 1300mAh packs, but five minute flight times while testing out the flight envelope (including sticks to plastic) were par with the 7042 Flash biblades. Same with 5S, running 6" props provides higher top speed, but some more top end was on offer. That setup bumped me out of the BMPR-Recce class race by completing 8 laps in 78s.

As far as the basic electronics stack - I actually would highly recommend this for somebody looking to achieve extreme performance on a tight budget:
Furibee F4V5 FC/VTX // ZMR/Cicada 30A 6S 4-in-1 ESC // RCX LS2207 1700KV Motors // Floss 2.1 Frame
With a 1000uF 35V cap on the VBAT rail and a 220uF 25V cap on the 5V rail, everything stays clean and well behaved. Extreme efficiency is possible using a 5S battery on 6", and extreme performance with good disc unloading is possible with 6S batteries and 5" props.

EDIT: This build has been up-cycled into a dedicated long range 7" build using this frame and drivetrain, and the canopy has moved to a hybrid 5"/6" racer. This concept has been developed into the Floss2.1 7" Sharkitecture to support a lightweight HD camera (Caddx Turtle) with even more powerful 2508 1550KV motors.