if u dont use drop forwards and u have the money go with a Invert Mini they are like 324 dollars and get a light and good hpa tank about 130-200 or if u do use drop forwards Ion xe would be ok but i heard they leak a lot or if u have the money get a
F8 FUSION OR etek ego
personall i think tippmanns suck
Minis are like 400$ and you can buy hpa tanks for 60-90$, well the steel ones but they work fine, just a little heavy, your forgetting that if he buys this high end or any high end that hes gonna have to buy a hopper that can keep up, which are like 150$. Your right about the ION XE , they tend to leak and are made of shaddy parts, if you buy an ION,or anything from SP for that matter, expect to buy 200$ worth of upgrades just to make it decent. Also i dont know why you suggesting F8 when they're also 400$ or the etek which is 800$ when you can get VS1 for 180, VS2 250, Fusion LE 290, or the PMR 300
Also, what do you mean by indoor? indoor speedball? or indoor scenario play?