We get these type of posts A LOT! It all is what you prefer. It differs from person to person. Some like Glocks, some like Berettas. Some brands to go for are KWA, KSC, WA, etc. It depends on what you are looking for. (And dont try with 'Something cheap but good and durable and accurate' cuase if there was that we would all have it!) Get a good LBV, some extra magazines for your rifle, maybe a scope or red dot, and THEN go get a side arm. Chances are you will NEVER need to use it normally.