The Kanger Subtank Mini has loads of different coils at reasonable prices and it comes with an RBA head. The drip tip can get hot though, so I use a plastic POM tip.
The SMOK TCT has some very good reviews but it does not have a rebuildable head. You also might want to use a different drip tip on it.
I'll post a couple reviews from two goofy reviewers because I didn't get one myself. I'm a rebuildable only vaper.
The eGo One Mega is another option. You really want to use the CLR heads and not the CL heads. All the heads come ready to use but the CLR heads wick much much better and are rebuildable.. if you like having that option.
These are all good tanks for normal watt temperature control mods and none of them are prone to leaking.
To tell you the truth, I don't enjoy high watt vaping. It eats up too much juice, drains the heck out of batteries, and doesn't make vaping any more enjoyable. That's just personal preference. Every vaper has their comfort zone. It's great fun to watch videos of people blowing clouds at 80 watts, but it's not for everybody. I'm vaping on a 60w mod with an eGo One Mega using a titanium coil right now. 30w at 480°.