I paid $22 I think for lid and can at ace hardware. It's a 32g brute.
Since youre in an apt you might wanna think about a 20g or so. The biggest you can fit in the house. Whether it be a closet or alcove, theres gotta be somewhere you can fit a can.
As far as the ro/di you linked, well, if I had the money I would get it but the 5 stage deluxe should be fine. I am ordering one next week during the group buy at bulk reef supply, they will be $180 for that week for group buy members. I think they also discount some of their protein skimmers as well so if you have a bit of cash you might wanna check it out.
There's so much you have to get, lol, but you did get the biggest thing out of the way. haha... I would start getting the smaller things as well if you can, like a refractometer for salinity ($30 on ebay), water test kit (API liquid test is good), 2 powerheads, heater,lights, the SALT lol, stuff like that.
There are some really great deals to be had online if you just look real good. I shop alot at the following:
Bulk Aquarium Supplies - Reef Aquarium Supplies | BulkReefSupply.com ,
Aquarium Pet Fish Supplies, Tank Accessories, Products & Equipment ,
Aquarium Fish: Tropical Freshwater Fish and Saltwater Fish for Home Aquariums ,
Aquarium Supplies, Reef Aquarium Supplies, Aquarium Products, Fish Tank Supplies, Freshwater Aquarium, Marine Aquarium ,
Pet Supplies | Dog Supplies | Fish Supplies | Bird Supplies | PetSolutions .
the above are all top of the line in my book and each retailer will have some of what you need cheaper than the others will. To save the most $$ I usually buy a few things from each one and it has worked out really well for me. I don't hesitate to recommend them. There are some other places I've ordered from but the livestock or dry goods just werent up to snuff. haha
Think I wrote enough? Sorry for the long post just got on a roll!