Sorry if I misled you, but I do think the Basslink T would work for you "right now". It's just been my experience that people constantly upgrade until they are reasonably satisfied with their system vs. the time/money they are willing to spend over time.
Here are some questions that will help you decide:
You budget - is it $300? I think that's what the BLT costs.
What type of music do you listen to?
Is there any chance you could amp your 4 channels in the future?
Do you/would you ever fold the back seats down and use the whole bed area for cargo?
FYI: I have (2) 8" passive Bazooka tubes pushed by an 800w Soundstream amp (under the driver's seat) and I love it. It perfectly compliments the 90w/channel that I have for all my mid/tweets.
I have had a few Bazookas in my time and I love them. I chose the 8" because they have faster response and better sound quality than 10's - I listen to mostly rock/metal. And also (better yet), they both fit perfectly side-by-side under the double decker cargo shelf - so they don't take up much room and are completely hidden. You can get a 200w 8" or 250w 10" powered tube, but you also have ALOT more wires to move around if you plan on using the cargo space. Since my amp is under my seat, I can easily move those two tubes (and only 2 wires) around when I drop the shelf, drop the seats and use the cargo area.
I thought the Basslink T would look great behind the seats, but I chose the tubes instead because: 1) I didn't want something that big for only 1 speaker, 2) didn't want to move around the box and all the wires, and 3) be limited to only 250w of power.
I personally think the powerwedge and stealthox are both waaay overpriced.
Just food for thought.