ShopTo have got some very attractive PS Vita bundles going for under £135 right now, and determining the ebst one is all about what you want out of the console as a gamer. For my money, it's all about snagging the best 16GB memory card package possible, but again, it all depends on the games themselves. Most of the bundled digital game packs contain a mix of large and small Vita titles, along with a couple of PSP games thrown in for good measure.
I'd probably go with the bundle that gives you three of the Vita's finest titles in LittleBigPlanet, ModNation Racers, and WipEout with that bumper card. Do be aware that the Vita itself is wi-fi only, though, and it's the newer model which trades the OLED screen in for a more efficient battery.