you can get a good guide on what both cars are selling for by looking on carzone.ie..
i bought 2 new octavias, one in 2000 and one in 2003 drove both for about 2.5 yrs... bought the diesel 1.9 TDI... very comfortable car...very economical, powerful, roomy, good value for money... got a lot of extras as standard with this car... VW are mean in what they offer as standard, basically have the same engine...
changed for a renault megane cabrio... which i am now going to change, and the octavia / superb is in the shorlist!