The Zotac coolers are as short as the PCB too.
I don't think you'll get any better than a 660Ti or 760 outside of that rather unusual Asus card. Powering a fully-enabled GK104 die normally needs more PCB area for power regulation, exceeding your 9"
By the way, that Asus is short because it's EXCEPTIONALLY TALL.
Not only does the card protrude a good 1" higher than the typical card, the power connectors face upwards too. You'll struggle to fit that in many HTPC cases such as the Antec and Silverstone options and some of the mITX options will be cramped too. The zotac protrudes slightly but it's probably still 3/4" shorter and you can plug into it with the more flexible 6-pin connectors (the Asus needs a bulky 6+2pin connector).
If you're sticking with your existing case, then note that JAE's linked card is partially a blower which will exhaust some of the hot air directly outside the case.
are twin fan affairs, so they'll be quieter but as they don't really exhaust any air you'll need better case cooling to compensate.