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Speeding up Remote Desktop

Fellow Experts.

I need some help with RDP.

Little explanation first...
The company is divided into two offices:
- the first, which houses server room. Uses 1M/0.5M xDSL as an internet connection and Win2008R2, which runs database and ERP application.
- the second, from which users connect to the main office (via another xDSL, this time 1M/0.25M). Up to 8 users will connect simultaneously via Remote Desktop.
Both "branches" are connected via IPSec VPN. Both routers are Linksys BEFVP41, which means I don't have much configuration options to work on.

I've set up "QoS" (yeah, in quotation mark as you can't call it QoS) - default RDP port has the highest priority. My routers have similar options to this one:
http://ui.linksys.com/files/BEFSR81/v3/2.50.2/Qos.htm

My friend told me that even if I used policy based QoS, DSCP will be removed by my ISP (I'm new to QoS) and it won't work.

My users complain that the connection is slow and unreliable (RDP sessions tend to "freeze").
At first I've tried to use private IP to connect to the server via IPSec. It seems this type of connection is bit slower than using public IP address.
Of course, I've disabled all the graphical fireworks, disabled autotuning like in this tip:
http://blog.tmcnet.com/blog/tom-keating/microsoft/remote-desktop-slow-problem-solved.asp

Is there anything I can do aside from investing in a connection with bigger upload on the server side?
Let's assume for this discussion that users from the main office aren't uploading anything and there packet loss doesn't occur (as I haven't notice any abnormal losses).

I think I have posted all the important facts. If not - please ask and I'll answer...
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Unfortunately I'm VERY budget-limited (and our ISP's offer is very poor in that matter; the main problem is the agreement). But I'll definitely have to solve this problem.
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I have an alternative, from smaller provider just across the street ;)
I can get 15M/6M for the same price from them.

However the problem is the agreement - if we're to break it we'll have to pay a fee for every month till the end of the agreement (that means for another year).
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Thanks for the info. I've never bothered to read about RemoteApp. Will try it tomorrow.
I won't go for the virtualization as it'd be too much hassle on already working system.

In case of RemoteApp being unreliable I'll have another thing to consider - uWave Radio Relay. I'll have to ask about costs first though...
OK, it's time to close the question,

It's been decided we'll put 5GHz radio link between locations to solve the problem. There will be some NATting and routing but nothing special.

One note: I've marked upalakshitha's answer as the best one as I didn't bother to check RemoteApp before. It's a bit faster using it but mix of WinXP Home and Win2k prevents me from utilizing it on the production scale (don't ask me who decided to buy licences for Home ;) ).