+1  

Just plug the above numbers into spreadsheet and you'll have your answer.  With 20% diff increases, about BTC10 in one year (and few cents after that), BTC6.5 with 30%

0.163   12   1.956   0.2
0.1304   12   1.5648   0.2
0.10432   12   1.25184   0.2
0.083456   12   1.001472   0.2
0.0667648   12   0.8011776   0.2
0.05341184   12   0.64094208   0.2
0.042729472   12   0.512753664   0.2
0.0341835776   12   0.4102029312   0.2
0.0273468621   12   0.328162345   0.2
0.0218774897   12   0.262529876   0.2
0.0175019917   12   0.2100239008   0.2
0.0140015934   12   0.1680191206   0.2
0.0112012747   12   0.1344152965   0.2
0.0089610198   12   0.1075322372   0.2
0.0071688158   12   0.0860257898   0.2
0.0057350527   12   0.0688206318   0.2
0.0045880421   12   0.0550565054   0.2
0.0036704337   12   0.0440452044   0.2
0.002936347   12   0.0352361635   0.2
0.0023490776   12   0.0281889308   0.2
0.0018792621   12   0.0225511446   0.2
0.0015034096   12   0.0180409157   0.2
0.0012027277   12   0.0144327326   0.2
0.0009621822   12   0.0115461861   0.2
0.0007697457   12   0.0092369488   0.2
0.0006157966   12   0.0073895591   0.2
0.0004926373   12   0.0059116473   0.2
0.0003941098   12   0.0047293178   0.2
0.0003152879   12   0.0037834542   0.2
0.0002522303   12   0.0030267634   0.2
         
   360   9.7678929464   

0.163   12   1.956   0.3
0.1141   12   1.3692   0.3
0.07987   12   0.95844   0.3
0.055909   12   0.670908   0.3
0.0391363   12   0.4696356   0.3
0.02739541   12   0.32874492   0.3
0.019176787   12   0.230121444   0.3
0.0134237509   12   0.1610850108   0.3
0.0093966256   12   0.1127595076   0.3
0.0065776379   12   0.0789316553   0.3
0.0046043466   12   0.0552521587   0.3
0.0032230426   12   0.0386765111   0.3
0.0022561298   12   0.0270735578   0.3
0.0015792909   12   0.0189514904   0.3
0.0011055036   12   0.0132660433   0.3
0.0007738525   12   0.0092862303   0.3
0.0005416968   12   0.0065003612   0.3
0.0003791877   12   0.0045502529   0.3
0.0002654314   12   0.003185177   0.3
0.000185802   12   0.0022296239   0.3
0.0001300614   12   0.0015607367   0.3
0.000091043   12   0.0010925157   0.3
6.37300830919026E-005   12   0.000764761   0.3
4.46110581643318E-005   12   0.0005353327   0.3
3.12277407150323E-005   12   0.0003747329   0.3
2.18594185005226E-005   12   0.000262313   0.3
1.53015929503658E-005   12   0.0001836191   0.3
1.07111150652561E-005   12   0.0001285334   0.3
7.49778054567925E-006   12   8.9973366548151E-005   0.3
5.24844638197548E-006   12   6.29813565837057E-005   0.3
         
   360   6.5198530435   

Solution: do not re-use addresses. Send all change to another address, and track spends on the blockchain using the sending address...  No chance of duplicated tracking data (the sending address basically becomes your tx hash).  voila. No problem here other then MtGox incompetance.  Demanding a change to the core protocol is ridiculous.

The amount you invest should not matter.  If investing $2000 is not a good investment, how is investing $10,000 make that investment any better?
The risk is the same, regardless how much you invest.