Is it worth continuing to upgrade a 3906?

[Megazone23]

Okay, I've been away from the hobby for several years now. At the time, I was working on upgrading my 3906 E-Maxx. I have installed quite a few upgrades like the Proline PowerStroke shocks and Servo Saver; RPM bumpers, skid plates, A-Arms; and a High speed and torque/metal gear steering servo. I also bought but haven't installed Integy aluminum bulks (F/R); diffs with aluminum cup and hardened gears; steel CVDs (F/R) and center dogbones; and UE idler gears.

I figure that I'll need to get a RobinsonRacing Slipper kit, brushless ESC/motor combo, and LiPo batteries at a minimum, which I estimate to run me upwards of $300-400.

Is it worth it to continue upgrading this outdated platform? or should I cut my losses, sell it on eBay for what I can, and just buy a brand new rig? I've seen some 1/10 brushless trucks with 2.4GHz radios selling for around $200 RTR. Sure, they may not be of the same quality of Traxxas, but at a fraction of the cost, I could buy a lot of replacement/upgrade parts and still come out ahead.

I thought about upgrading it with the 3908 chassis, but then I'd have to replace the entire tranny, and I'm not sure if the front and rear assemblies could be moved as-is or would need to modified, too. Seems like I could throw a lot of money at that solution, too.

Or maybe I'll just keep it as a brushed rig and use what I would've paid in upgrades to get a new truck.

Here's what I'm considering as an alternative to continuing the upgrade path: http://www.nitrorcx.com/16c553-red-rtr-24g.html It looks like a pretty decent setup, and its wheelbase is only 9mm shorter than the 3906, so I could even re-use the HumVee body I painted for it. The other option is to move to a 1/8 scale, which is tempting as well. I'm not a racer, so whatever I end up with is only going to be for bashing around.

Any opinions are welcome.