Mine is the Luna-Pro F, which uses 9v batteries. It has a flash metering capability, which I've never used.
The MS 76/SR-44's that are in my adapter have been good for over 5 years.
I am very happy with the Pentax Spotmeter V, and since you have one, you have a benchmark to compare other meters with. I have been having a great time with the Weston Master (original and II) that I own but the dial isn't ASA so you DO have to know the conversion for your specific meter (there are variations between US and UK models)...
But the price of the Sekonic 208 is low enough that it should not give you serious pause... It weighs so little that you can always justify carrying it... And it's new and will come to you guaranteed. I find it to be durable. At one point, either a minor defect or more likely after a knock, I found the the needle grazed the pointer and tended to get stuck but it was a simple repair just to push the needle back down. Obviously I've invalidated the warranty since then, but this is such a simply constructed meter that there is little that can go wrong with it.
The ASA dial tends to move when carried carelessly, so always double-check the setting - or learn to judge light so that you can sense when it's set wrong.
Gossen Luna Pro F user here, uses common 9v batteries has incident, reflective, and flash, and is very accurate especially in low light. They can be had with the case for $50-75, also flash metering is kind of nice to have if you don't wanna fiddle with the calculator on the side of your flash.
And the adapters that work with silver oxide cells are an excellent investment as well.