CONGRATS!
FYI:
We have used the Costco Alpha Omega seats for both of our kids, they are 5-point harness, and we pick them up at Big Lots for $100, they are the grow with them style, (they start after they are out of the pumpkin carrier, & last until they are 8yrs old and ready for just a regular seat belt, they are literally the last car seat you'll have to buy, well worth the $$, & next to the pricey Britax brand, they are the second highest crash test rated.
Good Luck!
Rich