Reworking a single driver enclosure

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Ok, so I have been using these speakers for a while now. Greg the Geek at GZ helped me out designing the boxes initially, and he came up with a 38L sealed box, which I then constructed from wonky offcuts of 19mm MDF. Ugly, ugly boxes.

Now, I am currently running a Boozehound Labs-style 6CZ5 SET amp, for about 1.5W per channel, and the speakers are plenty loud for my small room, and worked very well for the large party in a large, open warehouse. My complaint is that they are very directional above about 3.5Khz. I would like to add another driver to the box to help out. (basically, I'd like to make this a two-way sealed box.)

Now, this is not to say that I don't have mids and highs in the current configuration, I do, and they sound very good. It is simply the directionality issues, as the mids and bass fill the room nicely, but unless you are in about a 10 degree cone, the highs just are not there.


Speaker specs:

Features:
# Reinforced paper cone
# Treated foam surround
# Center whizzer cone for extended high frequency response
# Stamped steel frame
# 1.5" voice coil
# 20 oz. magnet

Specifications:
# Power capacity: 60W/100W RMS/peak
# Sensitivity: 90dB (1W/1M)
# Impedance: 8ohm
# Re: 6.6ohm
# Le: 0.60mH
# Frequency response: 36Hz~17KHz
# Fs: 40Hz
# Qts: 0.45
# Qes: 0.56
# Qms: 2.40
# VAS (liters): 56
# Xmax: 3.0mm

Dimensions:
# Overall frame diameter: 8"
# Required cutout: 7.13"
# Mounting depth: 4.0"

I am looking at the following tweeters:

http://www.mcmelectronics.com/produc...53-526-/53-526

http://www.mcmelectronics.com/produc...2801XL-/53-540

http://www.parts-express.com/pe/show...331328#reviews

I'm really leaning toward that Alesis 1" from Parts Express. It fits the budget best, and it has good reviews from others.

Given that I am currently building a PP triode amplifier with some serous sleeper tubes, I figure it is about time to work on the speakers again. I'll be using a pair of Hammond 1615 output transformers, and should be sporting about 15W of output per channel. I don't know if this makes a difference, but I included it just in case.