Have you tried the ss electric strings on the acoustic yet? Of course, you might need to use a heavier gauge string on the acoustic for a fatter richer sound.

I used the same strings on both my electric and my acoustic for a long time. I recently switched to heavier gauge strings on my acoustic for the sound. 

My wife is allergic to nickel so I understand the situation you are in. 

This is where I get my strings from. You can pick and choose to make your own sets even. http://www.juststrings.com/

Guitarhacker


Have you tried the ss electric strings on the acoustic yet? Of course, you might need to use a heavier gauge string on the acoustic for a fatter richer sound.

 

Guitarhacker



My wife is allergic to nickel so I understand the situation you are in.

 

One for the post count!

I'm no metallurgist, so these may have nickel in them... but have you looked at these?

I love the warm tone they give (silk & steels, haven't used the phosphors) but you may not be a fan depending on your style..

Silk and Steel:
http://www.amazon.com/DAddario-EJ40-Steel-Guitar-Strings/dp/B000OR88JE/ref=sr_1_2?ie=UTF8&qid=1343850233&sr=8-2&keywords=silk+guitar+strings

http://www.amazon.com/Martin-M1400-Marquis-Acoustic-Strings/dp/B0002GZQEM/ref=sr_1_3?ie=UTF8&qid=1343850233&sr=8-3&keywords=silk+guitar+strings

Silk & Phosphor
http://www.amazon.com/Martin-Phosphor-Acoustic-Guitar-Stings/dp/B002DC8OE2/ref=sr_1_6?ie=UTF8&qid=1343850233&sr=8-6&keywords=silk+guitar+strings

for a very long time when my wife and I first got married the jewelry was not made in stainless so I didn't "have the opportunity" to buy her much from the jewelry store. Now of course, there are a number of lines out that are specifically for people with allergies.


For a very long time, I used my Ernie Ball Super Slinks on both my electric and my acoustic. The acoustic had a thinner sound as a result but it played really nice as a result of the thin strings. 

I have since moved up a few millimeters in the thickness gauge when it comes to the acoustic guitar and have started using slightly heavier electric strings too. I still have a few EBSS sets to go through. 

yeti_tracks


I'm no metallurgist, so these may have nickel in them... but have you looked at these?

I love the warm tone they give (silk & steels, haven't used the phosphors) but you may not be a fan depending on your style..

Silk and Steel:
http://www.amazon.com/DAddario-EJ40-Steel-Guitar-Strings/dp/B000OR88JE/ref=sr_1_2?ie=UTF8&qid=1343850233&sr=8-2&keywords=silk+guitar+strings

http://www.amazon.com/Martin-M1400-Marquis-Acoustic-Strings/dp/B0002GZQEM/ref=sr_1_3?ie=UTF8&qid=1343850233&sr=8-3&keywords=silk+guitar+strings

Silk & Phosphor
http://www.amazon.com/Martin-Phosphor-Acoustic-Guitar-Stings/dp/B002DC8OE2/ref=sr_1_6?ie=UTF8&qid=1343850233&sr=8-6&keywords=silk+guitar+strings

I've never heard of silk and steel strings but it sounds interesting. It's not that easy to find out what the different parts of the strings contains of. I would like to know if the coating or even the core itself of the different string types and labels contain nickel. But it seems that the string companies doesn't provide that kind of detailed information.
I did find this one though : http://www.professorstring.com/index.php which seems to contain a lot of great generic information.
Anyway, I would like to thank everybody for the inputs in this thread. There's a lot to pick up on. I really appreciate it.