When you have GAS and no money...

I recently bought a new camera, didn't like, and returned it; it was the result of my most recent failed attempt to find a backup and daily shooter to compliment my E-M10. Instead of doing the intelligent thing and asking for a refund, I asked for a store credit. So, I bought a used GM5/12-32mm kit in excellent condition and still have a balance. Now I am having a What Should I Get attack.

So now I have a

• E-M10
• GM5
• Rokinon 7.5mm f/3.5 FE
• 12mm f/2.0
• 17mm f/1.8
• 45mm f/1.8

One thing I discovered over the past six months is that I will never be a zoom guy so I sold my 35-100mm f/2.8, have a 12-40mm f/2.8 in retirement on the shelf that I should sell, and now, a 12-32mm f/3.5-5.6 sitting next to it. Also, as you can see no large primes; everything is small enough to fit in my pocket.

So for physically small lenses that I don't have, there is not a lot left to consider. I keep looking at the DigitalRevTV review of the Panasonic 15mm f/1.7 sitting on a black GM5 like mine. It looks like the perfect marriage but, I have the Olympus 12mm f/2.0 and the Olympus 17mm f/1.8 so, is there any logical reason to get the 15mm beyond the fact that it looks beautiful sitting on the GM5. There is the gap between 17mm and 45mm but, I have never been a fan of the 50mm focal length so, if I get the 25mm f1/8, will I use it enough to justify it's purchase. I thought about the 20mm f/1.7 but even if I ignore all the possible problems it has on Olympus bodies and just use it for my GM5, there's the slow and noisy AF to consider, plus it's closer to the 17mm than the 45mm.

What to do?