You'd be surprised how little extra tyres, chain and sprockets cost.
For example, from wemoto, for my CB400 (less power than the SV650) a chain an sprocket set is £97. For a 2012 CBR1000RR it's £110.
For a set of Angel GT's in 120/60 ZR17 and 160/60 ZR17 you're looking at £86 and £115 respectively. In 120/70 ZR17 and 190/50 ZR17 and it's £95 and £125.
So £19 difference in tyres (obviously you'll go through more rears on the blade

) and £13 extra for chain and sprockets. Running a 1000 isn't really that much more costly than running a 400/600, apart from the extra tyre wear, but you'll probably save that on the front tyre wear
Looking at fuelly, a CBR100RR seems to be around mid-40's MPG, so again not a major difference.