Got a question about the use of ACL's on a router.

Currently our router is setup as a firewall/router (cisco 1750). I
have it setup using Reflexive Access Lists (IP Session Filtering)

 I am planning on putting m0n0wall behind the router and removing the
Reflexive Access Lists.

In your opinion would you...

1. Use minimal standard or extended ACL's to filter out port traffic
for a given IP..or..
2. Just make the router route packets and leave the filtering up to m0n0wall ?

Thanks

- Don