I've just upgraded my 12 year old Makita kit (It was top end MXT, but NiMH batteries) which has lasted the course but the batteries are dying and they've had 12 years of heavy DIY abuse..
I went for the Milwaukee M18 Fuel stuff, namely as they have good performance and most importantly I keep finding good deals for them in the pre-black-friday sales.. (£315 for both their top end Hammer Drill and Impact Driver kit with 2 x 5.0Ah batteries).. I've also got a body only M18 Fuel Jigsaw, nice enough, solid build, good pendulum throw, the only thing lacking is a speed control (it's got a crazy long throw trigger with good speed control that way). I'm looking at their cheaper circular saws, but there are some deals on the Fuel version so might be tempted and then it's just a multi-tool but the Fuel version of that was only launched in the US in August, so imminently expected here in the UK (It reviews well).
I am quite impressed, the drills /impact driver are a fraction of the size of my old Makita gear and yet a good deal more powerful.. The Drill Driver in particular is well built and the mechanics/chuck feel really good, and despite being so small it easily fights it out with the best Milwaukee/DeWalt have to offer.
I'd be happy with any mainstream brand, I always buy their better models for things I heavily use and mid-range or lower for lightly used items, since they all seem to come with 3 year warranties (Just registered my Milwaukee stuff to get that), I know from my Makita stuff, the tools that lasted 12 years of heavy DIY are all their MXT range.
I would not judge any of the brands based on entry / lower tier products, the cheaper Makita stuff I have does not have externally replaceable brushes, you have to dismantle it to change them, but their MXT range have easy to change external brushes.. obviously going brushless alongside performance gains removes any concerns..