so maybe buy a cheap eotech, honestly everyone says the clones are exactly the same as the branded ones, you can pick them up for £30. how much mney you willing to spend. Ideally you want a LiPo (mine cost £20 and is a beast) and you will need a cranestock, I will get the link for mine. Also you need a smart charger, I use the accucel digital 6 that can charge everything from lead acid to LiFe and everything in between. It has an LCD display and is brilliant. that will set you back £70 including the battery (although you can get cheaper) which is what I run, seriously good setup IMO.. You want some mags, probably mid caps you will find (not so annoying as winding up Hi caps) and as monty said either a molle plate carrier or something along the lines. If I were you I would get the gun, good gear and everything else meaning that if you want to buy another gun, you have everything you need for that as well, instead of spending a huge amount on one gun. That mask is fine although it may steam up quite a bit.