Frankly I don't really mind windows 10. Sure, they changed the UI so much that common tasks and activities can be a pain in the ass to find but I'm sure I'd get used to it. Frankly, the only reason I'm not using win10 is because I don't have any DX12 games, and that's the only real reason to upgrade. As for win7 - I loved it compared to XP and vista, but win 8.1 is so much faster + I got a couple of free 8.1 x64 licenses from some microsoft program and installed the OS on my main rig w/o looking back. I'm using Stardock Start8 tough I f#(king hate that metro bull$hit.
Unfortunately win 10 seems a bit more bloated then win 8.1, but it doesn't feel slower then win7, witch is good. Another reason not to jump on installing it even tough it sometimes bugs me about switching to win10 even tough I disabled the notification in the action center.
As for broadwell - it's practically non-existent in the Romanian IT market - most retailers had a few chips for sale at one point but they were too expensive and almost never in stock as opposed to the skylake launch and current price / availability. Personally I'd like to afford a Hanswell-E LGA 2011-3 machine, but the CPUs are silly expensive, mATX boards are hard to find and equally expensive, and rather poorly laid out with the exception of the Asrock Fatal1ty series witch is never in stock.
I remember LGA 2001-3 stuff was really well priced at launch (300 to 350 euro for a 5820k depending on where you looked) but the price skyrocketed when DDR4 got fast and cheap. I could have bought a Hanswell-E CPU then - even a 5930k witch was about 450 euro - but I didn't have the $$$ for the rest of the system, didn't have a proper video card for such a fast machine and didn't really want to do the i7 920 thing again where I spent a boat load of money on a computer way too fast for my needs witch I'd then sell a year later for a fraction of the price all because I got bored.
Meh - I'll probably go for an LGA 2011-3 rig if I can get a bargain on a mATX motherboard at one point - and I insist on mATX because it's quite compact while still allowing for multi-GPU setups unlike mITX. ATX stuff just takes up too much room, and I sometimes haul my desktop around the house or even at my parent's place or a lan party or something.
I'm keeping the 3770k and 2500k for my collection tough. I have a feeling K series CPUs - especially i7 CPUs will be hard to find later on and I'd rather take the plunge now, when they're still modern and usefull then fork out 200-250 euro for a kit later (like some people are asking for i7 920 / xeon + X58 board combo's).