If money is a concern, You might consider importing Chinese loupes. They are inferior to the expensive medical products from, say, Germany, US, Japan, Switzerland, but they are still superior to the clipons. One of the users here owns such a product. My impression was that it is absoulutely worth its price.
My loupe is a 6X Heine HRP with full visual correction and LED light. It is clearly a high end solution. But we are earning our money with these tools, and as a tool i consider good visual/lighting more important as using high end epilators like the Platinum.
I am considering to buy a 4x chinese product as a backup and for private use.
A final word to the magnification: the discussion on 2.5 or larger mostly concerns dentists. Our demands are slightly different. Especially when treating fine hairs i would not want to miss the large magnification.