Today I ordered a new server for aprs.fi. Intel Core 2 Quad (Q6600 2.4 GHz, single CPU with 4 CPU cores), 4GB of ram initially (will probably upgrade to 8GB later this year), 2*320G SATA disks (16 MB cache, NCQ, 5-year warranty). 1155 EUR, about 1700 USD. 1U rack case, two gigabit Ethernet interfaces (Intel). This should help performance a little bit, but I'll probably have to get another one later this year. This one should arrive in about a week.
I've also ordered a 4GB memory upgrade for the current server, which is 183 EUR (270 USD) - fully buffered ECC memory is a bit pricey, and that's what the server requires. The new one eats unbuffered, which is only around 100 EUR for 4GB now.
In case you're wondering, my paypal account is email@example.com. Using aprs.fi is free, and will remain so.