A lot of what you're intending seems more about personal preference, so take this advice with a grain of salt...
There are a lot of nice aftermarket bumpers that I wouldn't classify as "aggressive", though we may have different definitions of what "aggressive" means in regards to bumpers. Unless you're adding large tires, a lift, etc., one of the common full width bumpers add functionality and styling. The 10th Anniversary Bumpers look excellent and fit the form and finish of a relatively stock JKU nicely. Find them here:
https://www.quadratec.com/products/...p5QhK0fO2cY0CzsFFjsOtEh_mi-25RAAaAiPWEALw_wcB
The ARB bumpers are also quite nice:
https://www.quadratec.com/products/12000_120X_PG.htm
As are the AEV bumpers:
https://www.quadratec.com/p/aev/ex-front-bumper-wrangler-jk-full-width-12301400aa
The above are all top quality brands built to last. You can save a bunch of money by going with something like Quadratec's "house brand" bumpers (
https://www.quadratec.com/categories/jeep-bumpers/front-bumpers/front-full-width-bumpers/?f[0]=sm_field_brand:taxonomy_term:13) but I would suggest you stay away from no-name/Amazon/eBay specials.
By fenders, I assume you're referring to fender flares and not new fenders. Again, as with the above, unless you are adding bigger tires, the OEM flares add a lot of nice coverage with OEM quality. You can go with aftermarket "flat" flares, but you'll look funny with OEM sized tires, and you may not get as good of protection from snow/mud spray.
Note that many flares require you to cut and modify your OEM inner flare, you use an aftermarket option (usually made of aluminum). Personally, unless it is a dedicated trail rig, or you lived and wheeled in the southwest desert, I would run inner fenders. The really do help keep a lot of gunk and road debris off sensitive areas.
As someone with a lot of experience with snow and winter driving, I'll say that the tires that are good for snowy and ice covered roads are the worst ones for driving through deep snow and large drifts. The opposite is also the case. If your usage mostly entails on-road driving, a set of Blizzaks are hard to beat. If you're romping through deep snow and fields, a good set of M/T tires is hard to beat. Somewhere in the middle are A/T tires, most commonly the ones with 3-Peak Ratings. Like everything, there are compromises and trade offs.
Note that similar to tire differences and their best application, traction aids that are helpful in something like deep snow (e.g. a locker), are potentially problematic for on-road driving. If you plan to do both, you may want to consider a selectable locker (regardless of tire size). A LSD rear and selectable front are notoriously reliable and predictable for winter road and deep snow driving.
Amber bulbs are a preference for the most part. I had them for quite some time and they worked well enough, The most important factory in visibility for me was getting them as low as possible. Getting the highest angle of incidence is what helps prevent glare and the "light speed" effect of heavy snow. I used the yellow bulbs up top as more of a warning light system when parked or working through dark back roads where I didn't want to disturb people or animals.
