Congrats on purchasing a NAD. It's a fine product. I had a NAD 3020 amp for over thirty years til it finally gave up the ghost. Guess I got my money's worth. I recently replaced it with a NAD 316BEE in a secondary system. The 316 is driving vintage ADS L-520's, a 4 OHM speaker with no difficulty or overheating. I don't think you would have any overheating problems with a 326 unless it were enclosed with no ventilation driving a speaker that really digs down in impedence.
I would think the 326BEE would match up well with any quality speaker that is no lower than 4 OHMs impedence. Sorry, but I really don't get into the certain amps liking certain speakers thing that would produce either a warm or clinical sound. I am sure the NAD 326 will play nice with just about any speaker out there.
Good link above regarding closed end Banana Plug that Charles provided. No soldering needed and they will accept up to 12 gauge. I use a similar type of plug with 14 guage wire into my 316. It's a fast and easy way to hook everything up. Good luck and happy listening.
Marantz PM15S2 LE, Oppo BDP-103, Simaudio Moon 100D DAC
VPI Traveler V2 with an Ortofon Rondo Blue and Simaudio Moon 110LP, Technics SL-1400 with an Audio Technica AT-14sa and Pro-ject Phono Box S
Dynaudio Focus 260's, Rel T-1 and a Panasonic TC-P54S1.