Slow network speeds - Help anyone?

I'm synchronising my PC and laptop daily from home but the network is annoyingly slow - between 200KB/sec and 600KB/sec (if I'm really lucky). My router is about 10m - 15m away from my PC and laptop when I sync, and I have a besa-brick wall in between. I have about three bars usually on PC and the laptop usually gives me five no probs - even when I go into my bedroom, which is another 5-10m away and behind another wall.

I'd like some advice on how to improve it on a budget of about $100 - $200. Although the less I can spend the better.

I'm thinking I should probably update my router.

If you give advice can you please let me know both prices and what kind of speeds I could expect.

My ISP is MyNetFone - so if you suggest a new router and know if it will configure to my ISP or not, please let me know that too.

I should mention that I do want a combined modem/router.

Here is what I have (If I need to post more info let me know):

PC
i5 2400
4GB RAM
Ralink RT2860 802.11n/g/b Wireless PCIe Card
64Bit Win7

Laptop
i52400M
4GB RAM
64Bit Win7
Atheros AR9002WB-1NG 802.11n/g/b Wireless Network Adapter

Wireless Modem/Router
Dynalink RTA1046VW 802.11g/b

Thanks in advance!