You can for sure get new plates, but im not sure about the basket.
As far as suspension goes, i'd switch the front springs to Progressive suspension springs. Very nice upgrade, those. Rear suspension, thus far, unless you want to spend a mint on some nice Ohlins or Works piggybacks, i'd go with Progressive in back (still kinda pricey, but good shocks) or for the moment, as im a poor builder, im using MDI's or EMGO's. Cheap, and you get what you pay for, but they are stiff, im a big guy, and i like em that way.
I have a thread going about building a fibreglass cafe seat and bumpstop (i myself am making a boxy style one, but the process is the same) and there are a couple others about the same subject as well. OR if you dont feel that ambitious and dont mind dropping a hundred or so bucks on something you cant exactly tell if it will fit or not, AirTech Streamlining makes fibreglass seats in a bunch of different styles.
www.airtech-streamlining.com
My project at the moment is a 77 750B, Its going pretty good, but slow. I have a thread around here somewhere about pounding knee inserts into your tank as well. I suggest hunting up a spare tank to do this on, not because it's hard or anything, simply for the fact that you may someday want your stocker back, say for a long trip or something, as you will lose some fuel capacity beating it. Simple, easy process, if you make a paper stencil based on what you want them to look like and where your knees hit the tank, so you can get them the same on both sides. WARNING: DO NOT use the tank badge mounts as a guide...they are NOT in the same place on both sides. Ask me how i know this..hehehe.
Clip ons are something im still considering myself. Currently im running clubman bars on mine, but am not sure how i will like clippies....You WILL however have to ditch your stock headlamp ears, pick up some universal alloys on ebay or some such, and either push your forks up thru the top clamp a bit, or mount the clipons under the top clamp. Frankly i would go with the former, unless you can get your hands on a nice clean billet or steel top clamp. Otherwise, it looks ugly with those old bar clamps on it empty.
Performance mods, I am sticking with the single front disc that my bike came with, you likely have dual disc...so you're good there. Get yourself, or make yourself (see Nessims tutorial on this if you decide to make them) some stainless brake lines all around. Personally, the cost savings of making them, and my time involved, vs the the cost of just buying them from Z1enterprises.com, i couldnt justify spending time making them. If it was something where i just wanted a project, sure. But i want to get this thing done, and i have 97498459485 other things to do on it, so i opted to buy rather than build. I would investigate tires, as well. I think on my spokies the widest rear i could get on it would be prolly a 140. I have a brand new pair of tires on it, so that will come later for me. You could hop it up with a bore kit and what not if you really wanted to, but 850 is good size. Least thats what all the girls say, and they do it with a straight face too...HEHEHEHEH If you plan on ditching your front fender...find a fork brace on fleabay, or somewheres. This will keep the forks from "walking" a bit, and add some stability to the front end. I just found a Tarozzi brace on ebay and snatched up for 100 bucks.
REARSETS...good stuff on this site regarding swapping out your stock pegs, and using some Gixxer or Zixxer sets, with some easily fabricated brackets, ditching the stocker rear master cylinder and using the one from the modern bike. I have not done this yet, but a couple of guys have with great results, and hell of a nice look. I just have to figure out how to make them work, and still have a funtional kickstarter, as the set's brake lever apparently would get in the way.
Lots of other goodies too..
Thanks sir!