When someone sends me a session to mix, I generally assume they intended that everything is supposed to be included, but I'll tell you the secret to a great mix: it all comes down to good production. If they put pieces together that fit in the first place, the less you'll have to try and worry...
TH-U has some very nice stuff, especially the add-on packs. If you can score some extra cab IR's that's where it gets really juicy. I also like to use a VHT hardware preamp unit with a cab IR on some projects and it's awesome!
I was always surprised how little gear was ever used when I went and sat in on attended mastering sessions, so the same applies. Usually one or two EQ options, one compressor (doing almost nothing) maybe a de-esser if I'd been slack, A/D and a limiter. There's no one size fits all chain as the...
As far as dirt cheap, I can suggest an ebay hunt for the old Groove Tubes mics. There were ( AFAIK ) two series of these, and the second were particularly affordable. At one point I had four so I must have liked the results!
Literally don't worry about it. Compromising for a single format means compromising for all other formats. Make a great mix and master and it will work on earbuds and everything else.
Adam
You know what? Don't normalise. Set your songs out on different tracks in the order you want them on the record. Then simply change the fader volume for the tracks to get them to sit well next to each other by ear. Use EQ to 1. fix an issues on a track, then 2. another EQ to even out the tone...
That's nice, but not as useful as having one great preamp and one great EQ for recording on the way in. An Eq for the bus tends to be a more broad strokes situation and commits you to mixing with coming out of the box and another set of D/A and A/D conversions. Nothing wrong with bus EQ, but the...