2005 Sora is 8 speed. To switch to Tiagra (9 speed) or 105 (10 speed), you'll need at least a new chain and cassette along with the shifters. Ideally, you'd also replace the front derailler. Shimano used to offer Ultegra-level 8 speed brifters styled like the newer shifters but they don't seem to be available any more.