From an affordability for the quality perspective, a cajun injector is a great, low cost option.
There are other similar ones, under different brand names for around the same price or a few $ more too.
Lonestar 24" Vertical offset w/ Insulated Firebox & Performer Platinum
Former owner: Jambo Backyard, Klose BYC, Med. Spicewine, Pitts & Spitts, XL & (2) Med. BGE's, 22" WSM & (2) 18" WSM's, 18" & 22" Weber Kettles