For ease of installation, your best best bet is probably a Britax seat. They're also very comfy, and have some very nice features.
1) Britax Advantage/
Britax Roundabout. (The Advantage has been discontinued, but is still widely available.)
Weight limits:
· 33 lb. rear facing
· 40 lb. front facing
Features:
· EPS foam (like you find in bike helmets) to help protect the head
· Built in locking clips, which make installation much easier in many vehicles
· Easy to use tether which can be used both front and rear facing
· Twist-free straps
· Easy to use harness adjuster (There are seats which take my full strength to get just barely tight enough. The recommendation is that you should only be able to fit one finger between the child and the straps at his collar bone.)
· The Advantage has "infinite" harness adjustablility (you turn a knob to move it up or down), while the Roundabout has regular "slots."
· Any harness slot may be used front facing (most convertible seats only have the top slots reinforced for front facing use.)
· Well padded.
Cons:
· Price! They are very expensive—approximately $200-$230 for the Roundabout and $250-$260 for the Advantage.
2)
Britax Marathon.
Weight limits:
· 33 lb. rear facing
· 65 lb. front facing
Features:
· EPS foam (like you find in bike helmets) to help protect the head
· Built in locking clips, which make installation much easier in many vehicles
· Easy to use tether which can be used both front and rear facing
· Twist-free straps
· Four sets of harness slots to fit taller and shorter kids well
· Any harness slot may be used front facing (most convertible seats only have the top slots reinforced for front facing use.)
· Well padded
Cons:
· Price! It retails for $220-$250.
3)
Britax Wizard.
Weight limits:
· 33 lb. rear facing
· 65 lb. front facing
Features:
· Side impact protection
· "Infinite" harness adjustablility (you turn a knob to move it up or down)
· EPS foam (like you find in bike helmets) to help protect the head
· Built in locking clips, which make installation much easier in many vehicles
· Easy to use tether which can be used both front and rear facing
· Twist-free straps
· Well padded
Cons:
· Price! It retails for $250-$270.