You may want you budget a new front wheel with a dynamo hub if you intend to use a dynamo charger, as they don't work with out one.

Not sure why you would need a charger, these are only really useful if you are doing long distance cycling / touring when you will be away from a charging point longer than the device will hold charge when in use, otherwise they are a lot of expense for something which will have very limited use. A portable battery pack / solar panel charger may make more sense if you are not travelling far, if it is even needed at all.

For the other things on your list, the saddle sticks out; saddles are an item which is not a one size fits all, don't assume that the Brooks B17 will be more comfortable that the stock saddle, you may need to try several different designs / brands before you find what works for you. The same goes for grips, for some people, the stock grips will be fine, others will want ergo types, like Ergon/Specialized/Bontrager and others make.