Define "cheap". I would look at the GT Hunter series, .006 runout vs .003 for the XT, you will not notice the difference. Easton and Beman have some nice arrows in your (cheap) price range as well. Stay away from the loose arrows in the box a big box stores.Arrow length is a personal thing, you don't need 1" in from of the riser for BH clearance any more, just make sure you are at least 1" in from of your rest (Rage blades extend way back). Now arrow spine. You "may" be able to get away with a 400 spine if the arrow is 27" or shorter but I would opt for a 340 spine for an arrow that is 28-29". For most companies the smaller the number the stiffer the spine. Carbon Express is backwards, 350 is a wash. The spine is how much the arrow shaft deflects. The test is a 29" shaft supported 28" apart and a 1.94# weight is hung from the center. So a 340 spine deflects .340" It's not rocket science but you do have to do some homework.....
**important** should you go with carbon please get in the habit of flexing your arrows to ensure the integrity has not been compromised by damage caused by hitting them with other arrows or misses. Carbon is tough and it is either straight or not but you still need to be aware, this is one reason some still prefer aluminum.