Decent hose end is like 5-10 bucks. The ones from the parts store work fine. Add a bucket, a mitt, a jug of car wash (meguiars deep crystal is everywhere and works well), and something to dry with (personal preference there).
Done. I dunno what else you'd spend stuff on besides some stuff for the tires and interior surfaces. Personally, I prefer to have neither, and just scrub the wheels and tires as a last step during a wash, and dust off the interior. Bing bang boom.
I cleaned my car up for the first time in a long while last week, and got compliments on the orange-peely factory paint that was waxed at least a year ago. It would appear that NXT + Deep Crystal are slightly magical...I must admit, it does look decent.
Then again, I did buy a grey/silver car for a reason. My Mazda's dark-ish color has a bit of a lovely 'liquid metal' thing going on when it's shiny and clean, but doesn't hide dirt like my previous 'bright silver' Nissan (RIP). Conversely, the Nissan also wasn't gonna wow anyone with a good wash and wax. The important part is that any metallic grey, plus your golds and other common desaturated metallic shades...they don't show scratches, swirls and whatnot. Great cars for lazy people.
I didn't catch what color your roadster is...they seemed to be overwhelmingly black. If yours is indeed black...well, go with god. And take Ganesha and Buddha and some dudes along, as well. You will need them to concentrate their powers on your inevitable swirl marks.