best combination for red? try checking the 'click & brag' section for GSRstilez's post on his Cinnabar Red Integra. i thought it looked very wet with EX w/caranuba + Natty's Paste Wax although this is more than $20. EX w/caranuba with 3 coats should be nice.
i think
NXT would also be a good choice, plus fits your $20 cap.
as for polishes, a question to ask is what kind of paint defects do you have? pictures can be helpful.
i've found Poorboy's SSRs to be some good polishes, and they've worked well for me. SSR 2.5 is quite aggressive, and with a cutting pad, is good for getting rid of swirls. sometimes it'll leave some hazing behind, so it is good to follow it up with SSR 1 with a polishing pad.
other people might have some other polishes they can suggest. 1z seems to get quite a bit of recommendations as it is easy to work with. i don't have any experiences with 1z products, so i wouldn't know.
if you need a good all around polish, i've had good results with
Meg's #80 Speed Glaze as it is quite aggressive at getting rid of spiderwebs and leaves the surface ready for your LSP. depending on what you're trying to remove, you could use a cutting or polishing pad.
waxes/sealants - there is a bunch of good ones out there, take your pick. before buying new stuff, try using your current stuff with the PC. i don't have any experience using 3M SMR, so i don't know which pad to use with it. but for #7, use a polishing pad. for #26, you can do this by hand, or if you have the liquid version, with the PC and a finishing pad.
also be sure to check out the article DavidB has about the PC. you can get to it by clicking on the 'Learn' button and the link to the article should be on the main page. also there is post in the Hall of Fame, i think, that talks about accessories for the PC.
good luck!
