Some "Known" fighters coming over to the UFC:
Yoshihiro Akiyama - Debuted UFC 100: Signed as a 12-1 big draw in Japanese MMA with no fights going the distance. ($40,000 per fight)
Little Nog - Debuted UFC 106: Pride veteran. ($100,000 per fight)
Jake Shields - Debuted UFC 121: 5 year undefeated streak, Strikeforce champion. ($75,000 per fight)
Antonio McKee - Debuted UFC 125: Signed from MFC on a 15 fight winning streak. ($15,000 per fight)
Jorge Santiago - Debuted UFC 130: 11-1 steak before signing, beaten names such as Khalidov, Horn, Prangley, Bahadurzada etc. ($36,000 per fight)
Nick Diaz - Debuted UFC 137: Had a 10 fight winning streak plus Strikeforce champion. ($200,000 per fight)
Hatsu Hioki - Debuted UFC 137: 24-4 veteran of Japanese MMA, at the time usually ranked in the top-5 Featherweights in the world. ($15,000 per fight)
Cung Le - Debuted UFC 138: Former Strikeforce champion, action movie star. ($350,000 per fight)
Jason Miller - Debuted TUF 14 Finale: Well travelled fighter, fought some big names, minor TV personality. ($45,000 per fight)
Alistair Overeem - Debuted UFC 141: Top ranked Heavyweight ($250,000+ per fight)
Glover Teixeira - Debuted UFC 146: Well known within MMA, on a 15 fight winning streak. ($15,000 per fight)
The $$$ data comes from Wikipedia. These are basically fighters whom i recognised before they had signed with the UFC, i consider myself to be a fan of all MMA and i follow it casually online so these are all names that should be recognisable to anyone who is interested in the stuff that goes on outside of the UFC.
If i was to guess i'd say Khalidov was offered a maximum of $45,000 per fight - possibly as low as $15,000.