Need to upgrade but what to get need advice

Adding the Jolida tube preamp to your system as previously stated should work great.

IMHO, your NHT 2.5i speakers are just not that suitable for a tube amp, although one could work. It would probably need to be at least 100w/ch which could easily exceed your budget.

NHT 2.5i specifications:
Impedance - 6 ohms nominal, 3.6 ohms minimum
Sensitivity - 86db

Tube amps generally work better with speakers where the minimum impedance only drops slightly below the nominal impedance. In addition to the impedance issue, when using a lower wattage tube amp, it would be best for the speaker's sensitivity to be at least 90-92db or higher.

As far as Jolida's products, the JD1000RC Integrated Stereo Tube Amplifier would probably work well, and does have the HT bypass. Since this is an integrated amp (preamp and amp in one chassis) there is no need for a preamp, however new retail is $2700.

What do you guys think of this combo with my 2.5..McCormack RDL-1 pre amp and DNA 0.5 amp.i can use this for music and us my avr for home theater.will this combo be a noticeable improvement over my current one.

Just adding the RLD-1 for 2 channel music listening should be a very noticeable improvement, and should be somewhat easy since it has HT bypass. The DNA 0.5 is also a very nice amp, and if it is a basic model, it can be sent to McCormack for upgrades to be even better.

I own a Jolida Fusion pre. All tube. Would work well in system as describe by Tls49. They retail at $1300. Could upgrade the B&K amp at later date. Not saying I have a problem with the McCormack route, just responding to your interest in a tube pre. Enjoy.