DAC for entry level system


Hello,
I have an entry level system.
Speakers: Vienna acoustics Bach.
Plinius 8100 integrated amp.
Arcam CD72 player.
Logitech squeesbox touch.
I would like to buy a DAC to my system(prefer used to get more for the money), but I don’t know what price level of DAC will get me much better result compare to the internal DAC that I have now in the Arcam and the Logitec. Will(example of price groups) $179 HRT music steamer II will do it? Or $379 Musical fidelity V-DAC MKII, or $649 Simaudio 100D, or $995 Rega dac.
Thanks.
bedel
Foster_9, thank you for your input. I guess there is no short cut here, and I need to start to audition different level of DACs in my system.
Take a look at the ODAC sold at JDS Labs. There are a number of reviews on it, especially in the headphone forums. For the hefty price of $150 you won't be disappointed.
I just got a 2 year old Rega with a year left on warranty for $550 online. So you can have one for much less if that is the route you want to take.

Still waiting for it in the mail. So cant say much about the Rega yet. It will be used with a Marantz CDP 5004 as a transport.

Sterophile has a review comparing V-Dac and Rega. The reviewer liked both said it depends on your system and preference.

The HRT streamers (top of line $375) has a review which says its amazing but you have to use extra USB power hubs to get the amazing results.

All have got a good bit of online press so there is a lot of research that can be done.
Take a look at the ODAC sold at JDS Labs. There are a number of reviews on it, especially in the headphone forums. For the hefty price of $150 you won't be disappointed.

Unless I'm mistaken, the ODAC is a USB DAC only.
Thank you Detredwings. I'm not familiar with the ODAC, and I'll read about it. At list it's good starting point due to the low price.
Thanks Darkstar1. It's interesting to read that the V-Dac was "competing" with the Rega that coasts more than twice.
I'll try to get few units and get a filling for what I should expect to get for different price level of DACs.