Business_kid has a point about ARM based systems (although that me less a factor in the future with emulation). So, if you're talking about a Linux based tablet with X86 and sufficient processing power, you're going to be having to look at some of the higher end & newer tablets coming out (mostly Win8 models). That means a price tag in the $1200+ range.
My x86 tablets are convertibles. But they are also Atom-based systems with just "good enough" power.
TobiSGD has a point,... unless you need one of the features PowerShell has that another shell doesn't... See;
PS: I do not know how objective the above link is in making comparisons.