new squid setup, optimizing cache

["Dave" <dmehler26@xxxxxxxxxx>]

Hello,
   I'm setting up squid on a new machine, this one an OpenBSD 4.2 router. 
The install went fine and all, but now i come to configuring squid. I gave 
the squid cache it's own partition in this case /dev/wd0h, on the first 
drive, it's got soft updates enabled on it, and is 17.6 gb in size. I was 
wondering the best squid optimizations?
   I read that the cache size shouldn't exceed 80% of the total space so 
would that be 80% of the 17.6 g partition And when entering this on the 
cache_dir line should the size be approx 15000 or should i append something, 
15g for instance?or the entire disk? For the memory and cache replacement 
policies Heap LFUDa, or is there a better choice?
   Unrelated to cache, but my logformat i've got the squid logformat 
uncommented, i'd like to display it's time formats in local time for 
interpreting at a glance. Is this doable?
Thanks.
Dave.