Freaky - I just picked up my new 6pc 18v Milwalkee 'red kit' this arvo...$1k will get you 3/4 of that on-sale. The kit includes - hammer drill/impact drill/torch (duh?)/reciprocating saw/circular saw/angle-grinder & I got a jigsaw skin as well.
"To get going" basically any decent brand should do. If you don't want to have to change it over in a couple of years, talk to your supplier. The intended use & amount of use should determine the level of quality you're after.
Having a joinery for +20 years I bought many battery drills & tools for the workshop and for my employees to abuse. I've used most brands over the past 23 years (with the exception of GMC & Ozito - just can't bring myself to buy that cheap).
Makita was always the best when I started, but went through a crappy stage, I know that their top line (LTX) as mentioned is very good. I gave my 7.2V battery drill I bought when I was 15 to a work experience kid years ago as he showed some interest but had no money to buy tools (prob traded it for a Fosters long-neck). I still have all my Makita gear I bought during my apprenticeship (early '90s).
DeWalt battery drills were very good for a couple of years. I also have an old Bosch that I gave my wife to use (smaller drill), it smokes every time you use it, but the battery holds a great charge. I had a Panasonic for a very short period of time, but was 'lost' (left on-site) by an employee - kissed $600 goodbye on that, but it was by-far the smoothest drill I've ever used, not sure about current kits though?
I did buy a 14v 'Ryobi' 5pc kit a few years back - gave it to my dad a month later after the reciprocating saw wouldn't cut through a pine stud, although the small circular saw was great for cutting strips into plaster walls when doing renos.
Festo / Festool p!ssed me off as I bought a few of their products and they all failed just months after the warranty period finished. I thought it a bit suss, so called the distributor & was told "3 years is good, don't know what your issue is"...so I went on to explain that my 6yo DeWalt & 10yo Makita gear was still going! I went through 2 / $150 Metabo heat guns in about 2hrs one day so went to M10 & bought a cheapie - lasted 6 months!
I bought a couple of 'Worx' 18v drills for the workshop and they lasted pretty well considering how cheap they were.
About 4 years ago I sold all my old power & battery tools. Shortly after I decided I needed a battery drill so looked at a few options and ended up getting talked into 'Maktec', which I was told was made by Makita...was lied to or Makita fell asleep at the wheel. The battery doesn't last more than 3 weeks in storage after a charge without needing charging again. The drill itself seems ok, but not overly happy and have decided that for the small amount of work I want to do for myself, I want a gutsy/reliable kit - no cords, so went Milwalkee...from experience!