SET shortlist to drive tweeters in active system


Hello.

I'm building a DIY 4-way active system and thinking an SET for the tweeters might be a great choice. But wanted to get input from knowledgeable users.

The 20 to 600Hz range will be handled by active subs plus 10" drivers with their own 700W class D amp.
I'm still undecided about the midrange driver, but likely to be driven by my McIntosh MC275. It will be a 6.5 or 8" cone, though.

The top end will be through a Beyma TPL-150H, a pro ribbon with a horn playing from 2 to 23 kHz, spec'd as 102 dB (@1W, 1m) and a pretty constant impedance of 4.9 to 5 ohm.
I'm thinking it looks like a great place to use a SET, right? Which amps should I include in my shortlist?
Looking for SET holographic magic with dynamics.
The signal will come from a balanced IC, so XLR input would be preferred.
Reliability is a must, and the more the better. I will import this into Argentina, so sending the unit to the manufacturer would be difficult.
Price range: under 4k.

Thanks!
lewinskih01
George,
I'll look into the Pass Aleph. Hadn't thought about it. I confess I like tubes though. But I'la look into user feedback.
DIY is certainly an alternative for me. But I'm very hesitant to go with a cheap alternative I never heard of.

BTW, Charles: thanks for the input. I hadn't realized it was a SEP. Dynamo looks like a viable option. I know price does not equate to sound, but honestly down deep I'm struggling with replacing the Mac with two Dynamos plus Hypex.
Lew,
I understand your dilemma when it comes to performance versus price. You would naturally expect a linear relationship between the two but in reality this isn't the case in a number of situations. It honestly would not surprise me if you preferred the sound of the pure and simple Dynamo compared to the MAC amplifier.
Charles,
Lewinskih01 This would be a great amp for your tweeters, Pure Class A, 8 x output devices, doubles it's wattage to 4 ohms. Just came up on Ebay, could go cheap, and it's in the US.

http://www.ebay.com.au/itm/N-E-W-Nirvana-Electronic-Works-Class-A-A-20-Amplifier-Nelson-Pass-Pass-Labs-/231527816807?pt=LH_DefaultDomain_0&hash=item35e8221e67

Cheers George