Do them all.
Seriously. use your current art for your long and mid range figthing. judo and shuai chiao will show you how to work from the clinch and give you ALOT of throwing options. bjj will help if the situation goes to the ground. if you can only pick one, I'd pick bjj, as you may need the ground work one day.
i'm nobody...i'm nobody. i'm a tramp, a bum, a hobo... a boxcar and a jug of wine... but i'm a straight razor if you get to close to me.
-Charles Manson
I will punch, kick, choke, throw or joint manipulate any nationality equally without predjudice.
- Shonie Carter