Where did you get that from? The i3 2100 is faster than any previous i3! It’s faster than the AMD Phenom II x4 965/970 in games which the older i3’s can’t say.
Dropping the amount spent on the GPU to go for a GTX 460 1GB or 5850 (you can get them in the UK for about £130 now) will offer you half decent performance for a lower price.
Other than that it looks like you are being misinformed a lot. Check out reputable sites offering reviews and benchmarks such as anandtech, toms hardware, Guru3D, Bittech etc.
EDIT - A comparison between the i3 540 and i3 2100 - The 550 is slightly better than the 540 but not enough to equal the 2100.