That's a pretty good start.
Boxing related stuff is easy to figure out what you need.

In regards to the weights side of thing, as long as you've got a bunch of dumbells, you'll get buy..

I bought 2 cheap sets where you get like 100 lbs of weights and 2 dumbells. It really helps having 2 sets of dumbells as you can have them both set at different weights and it cuts out most of the getting on hand and knees every couple of minutes to change weights...
A barbell isn't really necesary.

In regards to equipment, I think minimum is best. A bench press basically is your main thing. It really only needs to be a small bench without the barbell holder. You'll pick one up for around $50. I find benching with dumbells is much nicer with a boxing background and your arms have more of a free range of motions, so you can rotate the dumbells slightly and you use a lot more of the smaller connecting muscles to balance the weight on the way up on down... Which is great. Fancy machines take this away and you can really only get 60-70% of the workout on a machine as you can with free weights... So don't get seduced by any of the big $300 plus machines.. You can work all the same muscles with free weights, probably more productively,,, and definetly cheaper!

From there my only other peice of equipment i'd consider essential is a chin & dip station/bar... If you can chin and dip like a pro, you'll always have upper body strength. Simple... If you only did these 2 exercises alone and absolutely nothing else, you'll still develop great arms and shoulders, chest...

I've met some very fit and professional (natural) bodybuilders and this is all they have also... It's the steroid heads that need 5 different exercises per muscle or limb..

I'm really dying for a treadmill or exercise bike... I feel great after a morning run, but on the colder mornings i'd love to stay inside and watch a bit of tv while exercising.

Anyway that's just my 2 cents on the home gym thing... The aim of setting up a home gym is to really just stay focused on your goals, and don't buy into hype over a bunch of fancy things that you really can do without..