Being a fan of the Wild Arms series; I would give you a hand.
Although; I haven't played 3 nor 5 actually... XD; (-owns them but hasn't played them?-)
People tell me though; that they never liked 3, so I would say go for 5; but you should buy both XDD; -brick'd-
On another weird note: I need a LBP buddy; I suck so bad by myself.