The best deal for your money on stock Connie tires will be the OEM Dunlop K700/K701s. They are good tires, though not great, and will last about 10k miles. You should be able to find them pretty cheap. Buy 120/70-18 and 150/80-16. The 120/70 front measures 111/78, so it will fit fine.
Search eBay for some Macadam 50s, or look up MotoRace.com and see if he has any. Buy these in 110/80 and 150/80.
Look for Dunlop D205s in 110/80 and 150/80. They will cost more than the OEM tires, but last 1k or 2k miles longer.
Avon Storm/Azaro tires make KILLER sporting tires, but usually last 6k miles. Buy a 110/80 front in these.
I THINK you can get Metzeler Lasertec tires in 110/80 and 150/80.
Bridgestone BT-45s are available in 110/80 and 150/80. These should be cheap.
'00 748/853 "Rosetta"
'05 Concours w/170/60VR-17