If it hasn't been changed recently why not take the opportunity, it's very easy on the SV, no issues with airlocks etc. Just drain at the water pump bolt, and take the make-up pipe off at the rad cap end and drop it down to drain the bottle.
I use a silicate free variety due to the generally improved seal durability, I use Toyota Red coolant (not the latest ultra long-life pink stuff which costs an arm+leg), it comes ready to use, somewhere round £4/litre but good for 5yrs so fairly cost effective and in my experience a good coolant (based on my Toyota, changed the coolant in that at 7yrs and it was nice and clean and didn't smell like some do). Their Red is definitely slicate free, specified for Japan built engines.
Most long-life varieties are OAT based now I think (may be wrong
).