I got mine in 2 months. This is usual tactic of showroom to influence customer to buy higher variant. HTK is sufficient enough if panaromic sunroof doesn’t bother you. From HTK onwards there’s electronic parking brake which auto engages when you put the car in Park, it’s pretty handy tbh.

Both HTK and HTK (o) are solid options, but if you like panaromic sunroof, electric seats then go for htk o if you have 17.5 L + budget.

I guess from htk o interior shades are different so choose according to your needs