the larger tires will be slightly more noticeable, but only marginally & there will only be a slight difference in how much the tires stick out. if you're wanting the tires to stick out more, you'll need to go with a rim with less backspacing. steel rims tend to hold up better offroad than the alloys (you can always bend a steely back into shape). but, the alloys will probably suit you fine for now. IMHO, stick with the stock wheels and save yourself some $$$. if you start using your rig off-road, you'll develop your own opinions of what will work for you and what doesn't.
as for lift installation .... you should really try doing it yourself. its straight forward & easy with regular garage tools. not to mention you can take the $$$ you save & buy some other goodies....
. the only thing some people like to use that you probably don't have lying around is a spring compressor, but you won't need one for OME. shoot me an email if you want help & i'm certain there's probably some info on here or D-web on how to do it.