I'll preface this by saying I'm currently nearing the end of my M2 year (yeah, Step 1 looms large, in just under two months, in fact). What computer you get and what you need for medical school can be very different things, and will depend on personal preference. During my M1 year I used my 9 year-old Dell Inspiron 1545 (which I'd upgraded, first by adding more RAM, then replacing a dead HDD, and finally by changing its processor from a T4200 to a T9800; the machine originally cost me $500, but the subsequent alterations in total cost roughly $350, with the RAM being the lion's share of this expenditure - it originally started with Windows Vista, but Dell provided a free Windows 7 upgrade). The end result is something that actually still rivals some of the cheaper machines on the market today (I'm looking at you, Core i3 computers). The only reason I replaced it at the start of this school year was because I had largely reached the limits of efforts to future-proof the machine, since that would require a motherboard replacement.
In medical school, all you really need to do on a laptop is: 1) view lecture slides, 2) type up notes/assignments (at my school we start practicing HPIs in M1 year, and H&Ps/SOAP notes in M2 year), 3) operate an Internet browser, 4) view course-related video, and 5) operate (usually browser-based) practice test software. Very basic stuff, and most newer machines built in the past few years will be able to do these things without any problems. In addition, the more rudimentary machines may tend to be smaller and more portable.
If you're looking for something more than minimal yet still want to get some bang for your buck, I would recommend looking at places other than traditional retail, by which I mean consider having your machine custom-built. I did some research into laptop components (because I build my own computers), and I found that if I could settle for some components that weren't top-of-the-line while having just those components that were truly essential for future-proofing, it would be cheaper for me to have a laptop custom-built than to try to piece a good build together from individual components.
While I went with
XOTIC PC, I did look at other custom building sites while I was shopping around my optimal build. My end result is as follows, and cost me just over $1100 some time in the middle of August 2016:
Base: Sager NP7256 with all branding removed
Processor: Core i7 6700-HQ Skylake
RAM: 16 (2x8) GB dual-channel DDR4 @ 2133 MHz
HDD: 1 TB, 7200 RPM (no, not SSD, but I back up all of the important stuff on a 3-TB external drive)
GPU: NVidia GeForce GTX 960M
M.2: SanDisk X400 256 GB SSD
OS: Windows 7 Professional x64 (this was an extra expense since Windows 10 was default; most other sites I looked at did not have this option, and that was a major dealbreaker for me)
Other perks: free shipping
I just looked, and there's a Dell 15 that is basically this computer with less RAM, no M.2 components, and an inferior OS (yes, I called Win10 inferior to Win7), but IMO even that is still not as good a deal at $750 because of Win10 and the lack of M.2 for futureproofing:
Inspiron 15 Gaming Series
I also use a wired USB gaming mouse with DPI adjustment that cost me about $20 shipped from eBay.