"anti trojan anti hacker firewall" - there was once a place called paradise

if this will be a server which you wont use for development or any other purpose other than just being a fulltime server, then you dont have to worry much about trojans.

as for the anti hacker part, that's kinda hard haven't heard of anything like that yet.

i'm using zone alarm in one of my webservers and it's doing pretty much of a good work. Although I'm not very happy with its report generation.

also, putting 2 firewalls together on the same box is not always the trend. you should pick two firewalls which you know will work with each other seamlessly (i find that hard to find). and you also need to let them run under close supervision because they will probably mess with each other (i tried zone alarm and norton firewall, they messed up).

best method for you as i think, just put an auto-updating antivirus (almost all commercial ones are), put a hardware firewall (costly though) and then keep watch