Just to be clear, in case you're considering Dynaco, their kits are designed to be easily built even with no skill or knowledge. All you need is a soldering pen and something to cut and strip wire. They are great for what they are, but tend to agree with bdp24 that you can in general do better, maybe even for the money. Dynaco are still good, just not the stone bargain they were back in the day when there was a lot less competition for affordable good sounding gear.
You really will want to stay with integrateds and away from separates. Big thing the people pushing separates never mention is they cannot compete with integrateds, not even close, without a really good interconnect, and an extra power cord or two. Separates make no sense, value-wise, even when the budget is huge. My system is pushing $100k and I wouldn't dream of separates. Waste of money! Some guys seem to be made of it. So watch out.
Since you're new to tube gear there's a few features to be aware of and watch for. Tubes are all biased, a small current that improves linearity. Some amps bias is automatic, others you have to set yourself. Its not a big deal, usually turn a screw or knob while looking at a meter, and doesn't have to be done often. But you do need to do this.
Some amps run only one tube type, like say KT88, others you can use different tubes like KT88 & 6550C. While there are indeed differences between different tubes like this, and even between different brands of the same tube, still these differences are relatively small compared to the difference between different amps. Transformers have probably the greatest impact on sound, point to point wiring and design next, then tube type, and finally tube brand. Keep this in mind and it will help shopping and making sense of reviews.
Now all that said I would second and third the guys pointing you at the Rogue Cronus Magnum above. Ticks all the boxes, and then some, and close enough to your budget to be worth the stretch even if you can't quite get him down there. Good luck!
