I think that the stock parts on the LCD are all fine, you dont have to upgrade anything to make the gun perform well.
If you do have to spend money then I would go for a new barrel, the stock barrel is a Small bore and a lot of paint isnt.
I have added just about all there is to add to my gun and I havent noticed anything better from the aftermarket parts vs the stock parts.
Red 2000 Angel LCD C&C w/ All black Dye parts-Single finger frame,volumisers,sightrail,old style 12" barrel, breach knob, vertical addapter, lowrise.
Inlaid cobra on/off switch.
68/4500 Angel A.I.R