Which Tweeter to use.. and Sub? oh and matching Center =S

[FreddieCorral]

Good evening to all. First I apologize for the lenght of this.

First allow me to thank you all for keeping this site alive, and providing everyone with such splendid advice.

I have followed this page without being a member for some time now. Trying to learn from everyone involved in posting here. Thanks to y'all, I recently finished my first project, A pair of Sub woofer cabinets housing Klipsch 8 inch Woofers from K-1051-K subs.. The boxes are Bass Reflex with a total of .85 Cu.Ft of internal volume. Box was made of 3/4 MDF with dual front layer and finished with high gloss Black on the front, top and bottom faces, and faux wood on the sides and back. These I made to have an enhancement of the sound for the studio/Computer setup. It's been powered with a Hafler P1000 Rack Amp and I couldn't be happier (Although, they could use some extra wattage). I tried them for a week with a BBE, but the sound wasn't so clear and became somewhat mudded. Instead I'm fixing to build a passive X-over to go from 35 up to 120. The BBE would've been great for HT, but not for this app. This proyect was made thanks to each one of you, and I really wanted to say THANKS!.

ALSOOOOO, now that I've proven myself "capable" of wood work and finishing, I would like to embrace my next project, for which I need further help.

I will be doing a 5.1 System for my HT. I have a total of 4 vintage JBL 2123H's, which I was planing on using on the front's and rears... The fronts being Floor Standing cabinets, and the rears, made to fit on the top corners (where walls and ceiling meet). Mainly, I have two issues. One, geographic issues (can't get parts to listen to so easily), and second, a vast lack of knowledge.

I'm looking for mainly two things.. or three?, one would be the best matching center channel speaker. Using a 10 Inch would be kinda too big, so I was thinking on a pair (or two) of 7 or 8 inch full ranges and one (or two tweets. So first question is, which speaker would you say could match the JBL's so that can be used as center channel? The second question is, which tweeter would you recommend to use all around? And lastly, since the fronts I intend to be floor standing - full range. I was thinking on adding a side firing sub. I was thinking on a 12 with front bass reflex ports (2), where I would also appreciate advice. I do have some OOOLD 15 inch JBL car subs (GT152D) and while I could wire series to get them to 8 ohms, and they have very high Sensitivity (93 I believe) the power handling I think is somewhat very low. Any Ideas? corrections? advice?

Thank you all again! and perhaps late, but wish you all a great DIY year.