Well, I have been playing a Spines/Fire lately and made it to 25, and let me tell you: she's freaking incredible. I should have named her Spawnmelter.
If I was going to farm with her, I'd focus on recharge, and recharge, and recharge. For everything else, one can use the inspirations that drop like rain when melting large spawns. That's how I've been doing it in Dark Astoria and the results are astonishing.
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I have a level 50 spines/fa and I use the build posted here.
http://boards.cityofheroes.com/showthread.php?t=183832
It is incredible. I couldn't believe the improvement in FA's durability after IO'ing it out.
The nice thing about this build is that it is relatively inexpensive. There are a couple IO's in there that will run you a bit, but you can pick up the majority of it for pretty cheap. No purples!
Spine/Fire is awesome for farming, have one at 50, purpled out, only because she's an excellent farmer. Focusing on recharge and damage is nice.
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Ok I'm lookin to roll a new scrapper for farming purposes. I already have a spine/sr up to 50 and is fun to play but I was wondering what kind of focus should I have in my resist/def lvl to make it fun?