For $350, I'd say get it. No question it'll be fun. (And I'm a big fan of both Fairdale and Taj).
At the same time, having spent the last 9 years riding mtb (dirt jump, ss xc, 4x, and DH) in addition to BMX . . . I think in terms of progressive 26" riding, you might get more out of a DJ mtb. Or, you might get more out of a 24" BMX like a Sunday ModelC/WaveC if you really want to ride concrete park a lot, etc.
Although I definitely appreciate the Taj's early-80's-retro vibe, it's worth pointing out that it does have long chainstays and a low bb. Progressive DJ-mtb's typically have around 15"-15.75" cs these days, so 16.41" is long. Also most DJ-mtb's are around 1" bb drop or even less (for example the TRANSITION BLT has zero bb drop while the PBJ has 25mm. So, 40mm bb drop on the TAJ seems pretty old school--reminiscent of a Mongoose KOS or something. The top tube on the Taj is 22.6"--so that's pretty comparable to a Large DJ-mtb. A 71 degree head angle is pretty close to DJ mtb's--they are typically 69, 70, or 71, and steepen up a little if you run a short travel fork (80mm travel instead of 100mm travel... or a shorter rigid fork). The now discontinued Volume Sledgehammer and Volume Hessian were more "progressive" for 26" (but I guess in the end not popular enough to continue making..... I have no idea where Volume is now--my impression is they bailed on 26"/700c). All this said, I haven't ridden a Fairdale TAJ, and I'd be stoked to ride one and see what it's like.
You should probably buy it, regardless of whether you also pick up an mtb.
http://fairdalebikes.com/bikes/view-bike-archive/2014-taj/ GEOMETRY
TOP TUBE LENGTH (ACTUAL): 575mm (22.6")
TOP TUBE LENGTH (HORIZONTAL): 600mm
SEAT TUBE (BB CENTER TO TOP): 440mm (17.32")
SEAT TUBE (BB CENTER TO TT CENTER): 414mm
SEAT TUBE ANGLE: 71º
HEAD TUBE HEIGHT: 111.5mm
HEAD TUBE ANGLE: 71º
CHAIN STAYS LENGTH: 417mm (16.41")
DROPOUT SPACING: 110mm
BB DROP: 40mm
BB TYPE: Mid Press Fit
SEAT POST: Use 27.2mm
SEAT CLAMP: Use 30mmBlack Market Edit1 (pictured with rigid fork, but people also run suspension fork)
Rocky Mountain Flow dj - $500 (broomfield)
http://denver.craigslist.org/bik/5062962839.htmlNS Bikes Metropolis 1 - $800
http://denver.craigslist.org/bik/5017201514.htmlDeity Cryptkeeper - $1175
http://denver.craigslist.org/bik/5020538963.htmlAtomlab Pimp 2 Dirt Jumper DJ BMX Hardtail - $650
http://denver.craigslist.org/bik/5023812717.html2013 Eastern maddog 26inch dirt jumper - $400 (I know Eastern sorta took a nosedive--just including it for comparison).
http://denver.craigslist.org/bik/5033645831.htmlI know you're on a budget . . . but if you did want to do a high end build on a DJ mtb, but stay loyal to a BMX brand . . . STANDARD makes a 26" DJ:
http://www.standardbyke.com/26-frames/