Vintage KLH sound good with tubes, I recently heard a pr of KLH-17 running of a EE with 8 watts a side , string and brass tone was very good.
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I have used Heresys which actually fill your outlined description if you are looking at the original or first series speakers. You won't get a lot of bass. If you aren't going to play them loudly and you listen fairly nearfield the world is your oyster. Remember most amps from the "golden age" of hi-fi wre el-84 based. Right now I am using a Fisher 400 receiver, that uses 7868s a close relative to the el-84. I happen to be using Hyperion 585s to good effect. If you want to fil;l a big room then sensitivities in the 90 DBs/W/M are in order. I have old LaScalas that will do it and old JBLs both of which were designed for power like this. They exceed your price limits and to be very honest bass performance from these speakers is not great. You may want to use a powered sub to help the lower octaves fill out.
I have heard this little amp with a pair of Sound Dynamics RTS-3 speakers and couldn't beleive the sound they produced. Harry Pearson (The Absolute Sound Editor) was smitten by this small low cost speaker saying it was the best little speaker he had ever heard.. You can pick up a pair of the RTS-3's for about $150 or less.
I used a friend's Jolida tube amp with EL34's with Vandersteen 1b speakers for awhile a few years back. I was bowled over at how good that setup sounded. Soundstage, imaging, depth, tonal balance were all quite good. If I had not been in the middle of big time upgrading (and using the 1b's while waiting for some new speakers to come in), I could have lived with the 1b's and Jolida. Don't expect rock concert levels out of small speakers and a small tube amp. That ain't happening.
Hope this helps.