As above Strider does take all steelcraft capsules. Also steelcraft is a sister company to Safe n Sound (both made by Britax).
Also I think you can hire the steelcraft capsule from places like baby bunting.

I know the InfaSecure Neon is supposed to be from birth to 4 (or maybe it's 7)
I have the Viper (model before the Neon) and I think it's a brilliant seat. you can get the Neon from Big W for a good price.