If you didn't go ahead and buy the 3880 yesterday, I'd recommend a 4900 -the ink works out a lot cheaper over time as you can use the bigger cartridges. I'd also get a rota trim or other professional level paper trimmer as you'll find the ability to print images laid out however you want in Lightroom means you will be able experiment. Also, sometimes bigger paper cut down is quite a bit cheaper than the smaller (A4) paper.
Lastly, if you haven't yet, then start ordering test packs of as many quality papers as you can and get a feel for what works best with your set up. You might also like to pick up a profiling kit for printers such as the i1 Pro as this will allow you full control over the process. You can even get them used on ebay but be careful as they may be at the end of their working life.