I got a new R.A.T. 7 for $150, its adjustable in almost every aspect. 5,600 DPI, racking speed up to 6m/second 5 buttons each programmable with three different modes, for 15 definable commands, Custom macros and most pieces can be replaced or adjusted for comfort. In the pictures attached you can see on the left side the rest can be extended, the back can be replaced and extended and the pinkey rest can be replaces.
https://imgur.com/a/OtlLI