Well, I can't help you with tekkit support, but I can tell you that Redpower2 now has computers in it. It also has microblocks, which are awesome and made of win.
If you do Buildcraft, I highly suggest Logistic pipes. It's a bit pricy (requiring diamond pipes and gold gears or circuit chips) but the level of automation you can do with it is simply staggering. On-demand crafting of anything you care to put in the Automatic Crafting Bench + Crafting Pipe for, as long as you also have all the sub-combines done, or have a supply of the items necessary on hand.