My chose was Epson Perfection V330 Photo scanner
Before buying anything I just test driver installation with my Debian squeeze installations.
1)Downloading Debian Lenny version packages iscan_2.26.1-3.tar.gz iscan-data_1.6.0-0_all.deb and esci-interpreter-perfection-v330_0.0.1-1_amd64.deb
from http://www.avasys.jp
Source file package iscan_2.26.1-3.tar.gz because there was not debian package for squeeze.

2)Install package cdbs libsane-dev libltdl7-dev libgtk2.0-dev libgimp2.0-dev libxml2-dev
Because dpkg-buildpackage command ask them.
I used Synaptic package manager for those package installation.

3)Unzipping and untar the source package.
gunzip iscan_2.26.1-3.tar.gz
tar xvf iscan_2.26.1-3.tar

4)Creating Debian package.
cd iscan-2.26.1 directory
dpkg-buildpackage
I got error message:”dpkg-genchanges: error: cannot read ../iscan_2.26.1-3.ltdl7.dsc: No such file or directory”
I don’t know why but just in case I run again command
dpkg-buildpackage
Now I get only warning message:”dpkg-buildpackage: warning: Failed to sign .dsc and .changes file”
So what?

5)Installing driver package.
Login to root (super user) by typing su in command line.
Then typing three command.
dpkg -i iscan-data_1.6.0-0_all.deb
dpkg -i iscan_2.26.1-3.ltdl7_amd64.deb
dpkg -i esci-interpreter-perfection-v330_0.0.1-1_amd64.deb

Everything seems okay when I open Synaptic package manager.
No error message not any broken package.
Then I made decision to buy the hardware from local market.
What I had to do was only connect the scanner usb cable.
Open Gimp and select menu File-Create-Scanning(iscan) or xsane or quiteinsane or whatever.

I think in file /etc/sane.d/epkowa.conf should be lines?
usb
scsi
I think in file /etc/sane.d/dll.d/iscan should be line
epkowa

Happy end.
Deleting windows7 from my hard disk and recycle the windows-only scanner
Now I am very happy Linux newbie and I like to share this