What's wrong with the I4's you have? only trying on different masks will reveal which are best for you so if you can get to a retail shop or event with traders there that's your best bet, asking on places like this is a waste of time as everyone has an opinion and no one but you knows how big your head is or how big your glasses are or what will fit. What works for me may not work for you but i wear E Vents, but my advice would be, if the I4's you already have work for you, stick with them.