Well I guess I'll have to be the odd man out here. First I too love the way a Pentax or Minolta spot meter works, but.....

I use a Seckonic 508 for all the reasons in their advertisements. I like it's size, ordinary AA battery, incident and spot and flash meter all in one. I don't entirely trust my zone readings and often use the incident dome as a double check on my brain functions. Sometimes I take an incident reading that doesn't make sense with what I got from spot readings and reread or adjust my thinking.

Downsides; expensive, damned digital readings that are difficult to translate into zone readings, and most importantly no readings in viewfinder unless you pop for even more $ with the new 608.

Best set up for me would be a Pentax spot, and a Minolta IV with someone to carry the beasts for me.