I really wouldn’t recommend a group 0+1/2/3 spin seat as they aren’t the best in terms of safety. Booster seats later can be as little as £30 so wouldn’t worry about price and much safer.
Good ones to take a look at for up to 18kg:
Joie spin—four types, two are RF only and two are i-size
Maxi Cosi mica
Britax Dualfix
Recall Zero Elite
BeSafe izi turn/twist
Are you looking to use the seat from birth? As there are some that have better inserts for newborns. If you already have a DC and are looking at a second stage seat, what centile are they on? As it’s be worth looking at a 25KG seat as these can last longer 