In all seriousness, I would advise that you send that letter to ebikes.ca. What you ant is well within the realm of what can be done except for one thing, 25mph is not going to happen. Most of the kits are limited to 20mph, as that is the federal law. Further, a low cost kit is going to slow down on the steepest hills. (that price range may still have you using SLA batteries, I am not clear of you intend that 1k to include the bike).

[I have no relation to ebikes.ca; however, they enjoy a very good reputation in the e-bike community]