Google Adwords could be worth the money, but you have to know what you're doing, or you will lose a lot of money!
What were you thinking about promoting using Adwords?
For an Adwords ad, I would not make it point to the general website, in order to get good ROI, you should point the ad to a landing page, with little distractions (like menus and links and other things).
In your case, I wouldn't suggest experimenting with Google Adwords right now.
Adsense is a good strategy, but it sounds like it hasn't been working for you... but it doesn't have to stay that way... you would be surprised that a few simple changes could make a big difference.
How much traffic are you getting? Do you use Google Analytics or any program that tracks which pages on your sites visitors find you through the search engines?
Make a list of all the pages that visitors find you through the search engines, and you can pick a few and try different adsense positioning and such, and we'll see what works best.
Sorry I threw a lot at you, so please let me know if you want me to elaborate on a point or two
I noticed you submitted your site for review... I will try to take a look at it later today. Keep up the good work!
Sherif