As far as mechanical keyboards and back lighting go the selection is limited, especially when you start looking at tenkeyless. I recommend forgetting about the back lighting and just focusing on getting a keyboard that's going to feel good and last, so if you're good with that then check out these options:
1. http://elitekeyboards.com/products.php?sub=leopold,tenkeyless&pid=fc200rtab - 99$ Leopold
2, http://www.keyboardco.com/keyboard_details.asp?PRODUCT=835 - £95 Filco
3. http://www.newegg.ca/Product/Product.aspx?Item=N82E16823129002 - 70$ QuickFire Rapid, while being the cheapest it's still a good choice. This is my current keyboard and I like it, I wouldn't recommend over the other two keyboard's listed but on a little bit of a budget it's an excellent option
All of these meet your requirements excluding the back lighting