Best non-bulky convertible car seat?

Caption says it all!
What's the best non-bulky convertible car seat but also affordable? Price range around $150-ish. I have a Honda Civic and there's already not much room with her infant seat in but when she outgrows it, I'm looking to get a convertible car seat so she can still be rear facing. Hoping to get one so that I can finally have someone fit in the passenger seat comfortably since there's currently barely any leg room. TIA :)

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