I get sale flyers from a computer retailer called NCIX. 
This caught my eye this morning. I was going to replace my laptop I use for my Solo gigs but I'm thinking this would be more future proof and would also give me the power to use Sonar as a live performance tool. 
Right now I just play wave recordings via Win Amp. It's bulletproof, but I would really like to go back 2 decades and use MIDI live again. Mostly to control effects per song. 
http://www.ncix.com/products/?sku=101631&promoid=1261
 

 
I then would need a small monitor that could mount on a mike stand. 
I'm going to price this out as a build based on an i3. 
 
 
 

Corsair Graphite Series 380T mITX Gaming White Case ATX Toolfree SSD Cages Modular Drive Cage  
ASUS H81I-PLUS/CSM LGA1150 Mini ITX 2XSATA 6GB/S 2XSATA 3GB/S 1xPCIe16 Dual Channel Motherboard  
Kingston Hyperxfury Memory Blue 8GB 2X4GB DDR3-1600 CL10 Dual Channel Memory Kit  
Cooler Master Elite V2 550W ATX Power Supply 12V V2.3 20/24PIN SATA PCI-EXPRESS 120mm Fan  
Intel Core i3 4130 Dual Core HYPER-THREADING 3.4GHZ Processor LGA1150 Haswell 3MB Cache Retail  
Kingston HyperX 3K 120GB 2.5in SATA3 SandForce SF-2281 SSD Drive READ:555MB/S WRITE:510MB/S  
$579.66 can. 

Use the right components, and that mini-ITX machine will blow away any laptop you can buy/build.

+1 to Jim's assertion.
 
Bob Bone
 

That's the plan, I have 2 old 2004 Laptops and my 2011 Asus Netbook, all run XP. I do all my web browsing on the one laptop and the other is my backup playback machine. It sits in a case and never comes out. The Netbook is my main playback rig but I also use when traveling for email  etc.  
 
They are good testament to how reliable those old Toshiba and Dell Laptops where. They all have new hard drives and upgraded RAM. The Asus now sports a 240 SSD. All are Solid & dependable but of course slooooooow. I'm only playing wave files live so it's not been an issue. But It would grand to have a portable system for both live recording and getting a little fancy at gigs.  
You just gotta like a desktop rig with a handle...
I think laptops are a thing of the past. A tablet is a better item for portable now.