Best Host IDS Tools

["frank" <chocobofrank () hotmail com>]

I have just setup my Web server on solaris platform and is planning to
deploy a freeware IDS. Now I am evaluating the below IDS tools :-
AIDE
Snort
Tripwire
Chkrootkit

and would like to have the comments from everyone on which is the best IDS
tools ? Or what is the best combination so that I can mix them together to
form a more complete IDS enabled environment. Or is there any other better
free IDS tools available ?

Below is the criteria of my evaluation.

1. CPU Loading/Utilization - Is the IDS resouce hungry ?
2. Disk Consumption - Is that too much log generated ?
3. Usability - Is the IDS ease of configuration and reconfiguration ? Or
have to take days in order to configure it properly ?
4. Completeness - Can the IDS detect most of the intrusion ?
5. Extendability - Can the IDS detect new intrusion ?

Any comments are much appreciated.

Frank