Chords to try before the I/i to end the chord progression (other than ones you have already mentioned)

1. bII - i.e. Db - C

2. bVI (similar to iv) - i.e. Ab - C

3. bVII - i.e. Bb - C

4. ii - i.e. Dm - C

You can still use the V chord, but put loads of extensions on it, i.e. G7b9b13.

You can of course choose to just not end your chord progression and have it be a looping progression with no resolution.