No idea mate. But you don't really expect to get what you paid for it two years ago do you?
Mod's don't add that much on the top of the price. I usually look at them being worth about half what the cost of them was.
I don't know if your asking too much, wouldn't think so. Some heavily modified ones are asking around 29-30+k. However, maybe that's too much for the market to bear when a 33 isn't that much more.
That said, I bought an mildly modified one and have thrown a fair few k at it since. Your's would be a fair sight cheaper. I guess it's the mentality of having it done yourself. But still, same problems when people who take this approach go to sell.
I think if your not going to leave it stock it's best to buy a modified one. Doesn't have to have all the go fast bits, but some of the good gear sure helps reduce cost. Especially if you've got all the reciepts for interested buyers.