I'm glad you got the error message squared away because I haven't encountered that. Though it looks like there was just some library that needed updating. Anyway…
That 6750M should work fine to start you out. It's not fast (I looked it up
here) but it's faster than the card I got started with and it should allow you to mine scrypt-based currencies (which I never got to work with my old NVidia card). It's more than enough to get you going for some small amounts of coin.
With MacMiner's config, you can use the "Bitcoin" information for any SHA-256 coin and the "Litecoin" information for any scrypt-based coin. He automatically has a few failover addresses in the client including his own pools which don't require a login, so do put a BTC and LTC address in so you can get paid if your primary pool goes down and it automatically starts mining on the failover pools.
Check out
http://www.coinwarz.com/cryptocurrency/ for a pretty good list of established (and some not so established) coins, with the algorithm each uses. The calculator is handy for generally keeping track of what will be profitable to mine on but prices fluctuate a lot and sometimes difficulty does as well. It's one thing to know what the price-to-difficulty ratio is now—it can't tell you what it will be at the end of the day. My guess is for starting out put "50" in both the SHA-256 MH/s field and the scrypt KH/s field but after you do a bit of mining you'll know empirically what values to put in.
So really, read up on the currencies and decide which ones you want to support. I believe that competition is good for the whole field but most altcoins are going to end up dead in the water. A lot of the hopeful-sounding talk around them is wishful thinking. In the other thread I talked about picking a brand-new currency and solo mining it—it's not because I have any confidence in the longevity of any coin started in the last 72 hours. You can also look at Cryptsy to see how the coins have traded against each other in the past. Personally, I look for auction and commerce sites to see whether there is hope that actual goods and services could be traded with the coin. Use your best judgment; most of the altcoins are useless but that's no reason not to support one(s) that you like and think should succeed.
Here endeth the unsolicited advice. Good luck!
I am grateful for all the people like you who have gone out of their way to help me understand crypto currency better and to mine them. I have done quite a bit of research into the altcoins and know which ones i agree with and think will succeed. Ive come across a few people who tell me i lack the hardware to mine any coins. I am wondering if you share that opinion?
Another question I have is what exactly do you mean by putting 50 in both SHA-256 MH/s field and scrypt KH/s field? On my macminer and under miner settings i see next to scrpyt says thread concurrency and wondered if I was supposed to type 50 there and couldnt figure out where to put the 50 with SHA-256..
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