Keyboard? For classical music? I'd be going for an acoustic piano, although it looks like you have a smaller budget.
You'll also have to tell us what you mean by "classical". Music from the Baroque period, Classical Period etc are not going to use the extremities of the range of the instrument as much as more modern classical music (eg, Bartok) or even the Romantic Period (eg Liszt - but I'm not sure you'd be playing too much Liszt:))
If you're going to play classical music on a keyboard, I think the bigger concern is about getting a weighted instrument so you can give the music the dynamic quality it deserves.
Hope this helps.