I am pretty new to airsoft myself. I would say if you have the money drop it on a combo kit (Rifle and pistol - not the cheap ones, see if your store will give you a deal if you buy both). As Kuro_Neko said I also love my KJW 1911 but I wouldnt put much faith in it on the feild (in terms of survivability). You cant even squeeze off those 25 rounds in one charge (for the KJW 1911) and mags are hardish to find. A subgun would sort of be the best of both worlds but ultamitally your call. If your going to get into feild play I would say AEG. And also keep in mind your consumables and maintance (eg - Green gas vs battery).
What kind of pistol do you have your eye on?