This reply is probably a little late, but anyway....
When you say ephedrine makes you nauseous I wonder if you took several pills at once without any caffeine. I constantly take a single 25 mg epedrine with a single 200 mg caffeine pill. Several ephedrines at once do make me a little nauseous- that may be partly because they have to put extra shit in there to make it harder to make meth out of. Caffeine by itself doesn't tend to keep me awake either. But a single ephedrine with a single caffeine pill does wonders for me, 1 to 4 times a day, and you don't build tolerance nearly as quickly as you would think. I'm over 200 pounds and have been taking ephedrine for a long time and I still get something out of it. (I would say 25 mg of ephedrine and 200 mg of caffeine would do more to keep me awake than 6 cups of coffee.) A break from time to time does seem to make it work better though.
I have though seen some research (whether it was quoted out of context or not I'm not sure) that suggests that extended ephedrine use can actually reduce the jitters you experience from occasional use and increase some of the positive effects on metabolism. (Possibly people are so concerned about cycling it because of the legacy of clen which the body attenuates incredibly fast? I know that at one time fitness writers like Bill Phillips were recommending ephedrine and caffeine be used in pretty much the same manner as clen.)
I read the article on Modafinil and it seemed pretty interesting, but I did a search on it here and this was the most recent thread that popped up about it so there must not be too many people with access to it.
I see a lot of people recommending green tea extracts but it has been my understanding that most of the products you get promissing green tea extracts are basically giving you herbal caffeine at unknown dosages. If I'm not mistaken, green tea is simply regular tea which is harvested early, thus other than extra antioxidants and phytochemicals that early harvesting preserves there isn't much magical to it. (And there was a study done recently indicating that hot cocoa has several times more antioxidants than green tea anyway.) Too, my experience is that herbal caffeine and herbal ephedrine (ephedra) are even more apt to cause nausea than their pharmaceutical grade OTC counterparts .
I did just go grab a bottle of green tea extract I had sitting around (got it on sale awhile back before I heard the whole bottle contains about as many antioxidants as a packet of Nestle's cocoa) and it does state that it is standardized to 50% polyphenol catechins, not sure what that means, but you can bet if it was anything magical aside from caffeine it would probably be synthasized and sold as a supplement (or drug) unto itself. I'll pop about 10 of them and tell you if they keep me up all night.
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