Make training available to everyone. Likewise, don't target a narrow group of teachers for technology training and use. Do everything possible to encourage all of your teachers to incorporate technology into their daily instruction. Consider alternatives to setting up a computer lab.
Computer labs have some distinct advantages.
It's easier to cope with wiring and environmental and security measures for a single classroom. If you have more classrooms than computers, a lab offers one strategy for assuring at least some access to all teachers and students. But a lab also isolates computer use, making it an occasional, extraordinary activity rather than an integral part of the instructional routine. In an ideal world, there would be a computer for every student in every classroom. Of course, none of us live in an ideal world, but there are alternatives to labs that may work more effectively for your teachers.